21620155006000 has 80 divisors (see below), whose sum is σ = 53389823011200. Its totient is φ = 8464060646400.

The previous prime is 21620155005949. The next prime is 21620155006067. The reversal of 21620155006000 is 60055102612.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×21620155006000² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21620155006000.

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, 114906825 + ... + 115094824.

It is an arithmetic number, because the mean of its divisors is an integer number (667372787640).

Almost surely, 2^{21620155006000} is an apocalyptic number.

21620155006000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21620155006000 is an abundant number, since it is smaller than the sum of its proper divisors (31769668005200).

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

21620155006000 is a wasteful number, since it uses less digits than its factorization.

21620155006000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230001719 (or 230001703 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 21620155006000 in words is "twenty-one trillion, six hundred twenty billion, one hundred fifty-five million, six thousand".