30977631221 has 8 divisors (see below), whose sum is σ = 31935312024. Its totient is φ = 30029575680.

The previous prime is 30977631163. The next prime is 30977631263. The reversal of 30977631221 is 12213677903.

It can be written as a sum of positive squares in 4 ways, for example, as 3783972196 + 27193659025 = 61514^2 + 164905^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30977631221 is a prime.

It is a super-2 number, since 2×30977631221² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30977631721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2399780 + ... + 2412653.

It is an arithmetic number, because the mean of its divisors is an integer number (3991914003).

Almost surely, 2^30977631221 is an apocalyptic number.

It is an amenable number.

30977631221 is a deficient number, since it is larger than the sum of its proper divisors (957680803).

30977631221 is a wasteful number, since it uses less digits than its factorization.

30977631221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4812631.

The product of its (nonzero) digits is 95256, while the sum is 41.

The spelling of 30977631221 in words is "thirty billion, nine hundred seventy-seven million, six hundred thirty-one thousand, two hundred twenty-one".