21620682690 has 32 divisors (see below), whose sum is σ = 52091562240. Its totient is φ = 5743079424.

The previous prime is 21620682689. The next prime is 21620682701. The reversal of 21620682690 is 9628602612.

It is a super-2 number, since 2×21620682690² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1394410 + ... + 1409829.

It is an arithmetic number, because the mean of its divisors is an integer number (1627861320).

Almost surely, 2^21620682690 is an apocalyptic number.

21620682690 is an abundant number, since it is smaller than the sum of its proper divisors (30470879550).

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

21620682690 is a wasteful number, since it uses less digits than its factorization.

21620682690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2804506.

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 21620682690 in words is "twenty-one billion, six hundred twenty million, six hundred eighty-two thousand, six hundred ninety".