21000020323100 has 144 divisors (see below), whose sum is σ = 56489709427200. Its totient is φ = 6598345777920.

The previous prime is 21000020323049. The next prime is 21000020323283. The reversal of 21000020323100 is 132302000012.

It is a happy number.

It is a super-2 number, since 2×21000020323100² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7036160 + ... + 9565959.

It is an arithmetic number, because the mean of its divisors is an integer number (392289648800).

Almost surely, 2^{21000020323100} is an apocalyptic number.

21000020323100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000020323100 is an abundant number, since it is smaller than the sum of its proper divisors (35489689104100).

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

21000020323100 is a wasteful number, since it uses less digits than its factorization.

21000020323100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16602292 (or 16602285 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21000020323100 its reverse (132302000012), we get a palindrome (21132322323112).

The spelling of 21000020323100 in words is "twenty-one trillion, twenty million, three hundred twenty-three thousand, one hundred".