21020330100 has 144 divisors (see below), whose sum is σ = 75826146816. Its totient is φ = 4367856000.

The previous prime is 21020330069. The next prime is 21020330117. The reversal of 21020330100 is 103302012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 431886 + ... + 478085.

It is an arithmetic number, because the mean of its divisors is an integer number (526570464).

Almost surely, 2^21020330100 is an apocalyptic number.

21020330100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020330100 is an abundant number, since it is smaller than the sum of its proper divisors (54805816716).

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

21020330100 is a wasteful number, since it uses less digits than its factorization.

21020330100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910006 (or 909999 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21020330100 its reverse (103302012), we get a palindrome (21123632112).

The spelling of 21020330100 in words is "twenty-one billion, twenty million, three hundred thirty thousand, one hundred".