21620611007516 has 24 divisors (see below), whose sum is σ = 39141289866000. Its totient is φ = 10437395399424.

The previous prime is 21620611007497. The next prime is 21620611007539. The reversal of 21620611007516 is 61570011602612.

It is a self number, because there is not a number n which added to its sum of digits gives 21620611007516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7638515 + ... + 10079093.

It is an arithmetic number, because the mean of its divisors is an integer number (1630887077750).

Almost surely, 2^{21620611007516} is an apocalyptic number.

It is an amenable number.

21620611007516 is a deficient number, since it is larger than the sum of its proper divisors (17520678858484).

21620611007516 is a wasteful number, since it uses less digits than its factorization.

21620611007516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2516981 (or 2516979 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 21620611007516 in words is "twenty-one trillion, six hundred twenty billion, six hundred eleven million, seven thousand, five hundred sixteen".