21202131020 has 48 divisors (see below), whose sum is σ = 50937526080. Its totient is φ = 7261814784.

The previous prime is 21202131011. The next prime is 21202131029. The reversal of 21202131020 is 2013120212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21202131011) and next prime (21202131029).

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

It is a junction number, because it is equal to n+sod(n) for n = 21202130986 and 21202131004.

It is not an unprimeable number, because it can be changed into a prime (21202131029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59276 + ... + 214284.

It is an arithmetic number, because the mean of its divisors is an integer number (1061198460).

Almost surely, 2^21202131020 is an apocalyptic number.

21202131020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202131020 is an abundant number, since it is smaller than the sum of its proper divisors (29735395060).

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

21202131020 is a wasteful number, since it uses less digits than its factorization.

21202131020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156002 (or 156000 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21202131020 its reverse (2013120212), we get a palindrome (23215251232).

The spelling of 21202131020 in words is "twenty-one billion, two hundred two million, one hundred thirty-one thousand, twenty".