51011421 has 16 divisors (see below), whose sum is σ = 69890688. Its totient is φ = 33075200.

The previous prime is 51011417. The next prime is 51011423. The reversal of 51011421 is 12411015.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51011421 - 2² = 51011417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51011421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51011423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78520 + ... + 79166.

It is an arithmetic number, because the mean of its divisors is an integer number (4368168).

Almost surely, 2^51011421 is an apocalyptic number.

It is an amenable number.

51011421 is a deficient number, since it is larger than the sum of its proper divisors (18879267).

51011421 is a wasteful number, since it uses less digits than its factorization.

51011421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 51011421 is about 7142.2280137223. The cubic root of 51011421 is about 370.8706571980.

Adding to 51011421 its reverse (12411015), we get a palindrome (63422436).

The spelling of 51011421 in words is "fifty-one million, eleven thousand, four hundred twenty-one".