51401421 has 12 divisors (see below), whose sum is σ = 78614172. Its totient is φ = 32251776.

The previous prime is 51401419. The next prime is 51401423. The reversal of 51401421 is 12410415.

It is an interprime number because it is at equal distance from previous prime (51401419) and next prime (51401423).

It can be written as a sum of positive squares in 2 ways, for example, as 30140100 + 21261321 = 5490^2 + 4611^2 .

It is not a de Polignac number, because 51401421 - 2¹ = 51401419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51401394 and 51401403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51401423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167826 + ... + 168131.

It is an arithmetic number, because the mean of its divisors is an integer number (6551181).

Almost surely, 2^51401421 is an apocalyptic number.

51401421 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51401421 is a deficient number, since it is larger than the sum of its proper divisors (27212751).

51401421 is a wasteful number, since it uses less digits than its factorization.

51401421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335980 (or 335977 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 51401421 is about 7169.4784329127. The cubic root of 51401421 is about 371.8134036434.

Adding to 51401421 its reverse (12410415), we get a palindrome (63811836).

It can be divided in two parts, 5140 and 1421, that added together give a 8-th power (6561 = 3⁸).

The spelling of 51401421 in words is "fifty-one million, four hundred one thousand, four hundred twenty-one".