21620551613416 has 64 divisors (see below), whose sum is σ = 48664250542080. Its totient is φ = 8804387275200.

The previous prime is 21620551613407. The next prime is 21620551613417. The reversal of 21620551613416 is 61431615502612.

It is a super-2 number, since 2×21620551613416² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21620551613417) 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, 55388766 + ... + 55777741.

It is an arithmetic number, because the mean of its divisors is an integer number (760378914720).

Almost surely, 2^{21620551613416} is an apocalyptic number.

It is an amenable number.

21620551613416 is an abundant number, since it is smaller than the sum of its proper divisors (27043698928664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21620551613416 is a wasteful number, since it uses less digits than its factorization.

21620551613416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111166694 (or 111166690 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 21620551613416 in words is "twenty-one trillion, six hundred twenty billion, five hundred fifty-one million, six hundred thirteen thousand, four hundred sixteen".