612221421 has 16 divisors (see below), whose sum is σ = 934964864. Its totient is φ = 349069824.

The previous prime is 612221419. The next prime is 612221443. The reversal of 612221421 is 124122216.

It is not a de Polignac number, because 612221421 - 2¹ = 612221419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612221321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22300 + ... + 41493.

It is an arithmetic number, because the mean of its divisors is an integer number (58435304).

Almost surely, 2^612221421 is an apocalyptic number.

It is an amenable number.

612221421 is a deficient number, since it is larger than the sum of its proper divisors (322743443).

612221421 is a wasteful number, since it uses less digits than its factorization.

612221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64260.

The product of its digits is 384, while the sum is 21.

The square root of 612221421 is about 24743.1085557171. The cubic root of 612221421 is about 849.1208538823.

Adding to 612221421 its reverse (124122216), we get a palindrome (736343637).

The spelling of 612221421 in words is "six hundred twelve million, two hundred twenty-one thousand, four hundred twenty-one".