21602354017020 has 48 divisors (see below), whose sum is σ = 69127532855808. Its totient is φ = 4937680918080.

The previous prime is 21602354016973. The next prime is 21602354017033. The reversal of 21602354017020 is 2071045320612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25717087696 + ... + 25717088535.

It is an arithmetic number, because the mean of its divisors is an integer number (1440156934496).

Almost surely, 2^{21602354017020} is an apocalyptic number.

21602354017020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21602354017020 is an abundant number, since it is smaller than the sum of its proper divisors (47525178838788).

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

21602354017020 is a wasteful number, since it uses less digits than its factorization.

21602354017020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51434176250 (or 51434176248 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

Adding to 21602354017020 its reverse (2071045320612), we get a palindrome (23673399337632).

The spelling of 21602354017020 in words is "twenty-one trillion, six hundred two billion, three hundred fifty-four million, seventeen thousand, twenty".