21425013100 has 36 divisors (see below), whose sum is σ = 46512038664. Its totient is φ = 8566362880.

The previous prime is 21425013097. The next prime is 21425013101. The reversal of 21425013100 is 131052412.

It is a super-2 number, since 2×21425013100² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21425013101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197379 + ... + 286021.

It is an arithmetic number, because the mean of its divisors is an integer number (1292001074).

Almost surely, 2^21425013100 is an apocalyptic number.

21425013100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21425013100 is an abundant number, since it is smaller than the sum of its proper divisors (25087025564).

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

21425013100 is a wasteful number, since it uses less digits than its factorization.

21425013100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91074 (or 91067 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21425013100 its reverse (131052412), we get a palindrome (21556065512).

The spelling of 21425013100 in words is "twenty-one billion, four hundred twenty-five million, thirteen thousand, one hundred".