616321252221 has 16 divisors (see below), whose sum is σ = 843500044800. Its totient is φ = 400141817648.

The previous prime is 616321252201. The next prime is 616321252223. The reversal of 616321252221 is 122252123616.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 616321252221 - 2⁵ = 616321252189 is a prime.

It is a super-2 number, since 2×616321252221² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616321252223) 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, 16252281 + ... + 16290158.

It is an arithmetic number, because the mean of its divisors is an integer number (52718752800).

Almost surely, 2^616321252221 is an apocalyptic number.

It is an amenable number.

616321252221 is a deficient number, since it is larger than the sum of its proper divisors (227178792579).

616321252221 is a wasteful number, since it uses less digits than its factorization.

616321252221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32542608.

The product of its digits is 17280, while the sum is 33.

Adding to 616321252221 its reverse (122252123616), we get a palindrome (738573375837).

The spelling of 616321252221 in words is "six hundred sixteen billion, three hundred twenty-one million, two hundred fifty-two thousand, two hundred twenty-one".