21202002120 has 64 divisors (see below), whose sum is σ = 68498781120. Its totient is φ = 5218953984.

The previous prime is 21202002119. The next prime is 21202002121. The reversal of 21202002120 is 2120020212.

It is an interprime number because it is at equal distance from previous prime (21202002119) and next prime (21202002121).

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

It is a junction number, because it is equal to n+sod(n) for n = 21202002096 and 21202002105.

It is not an unprimeable number, because it can be changed into a prime (21202002121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6793954 + ... + 6797073.

It is an arithmetic number, because the mean of its divisors is an integer number (1070293455).

Almost surely, 2^21202002120 is an apocalyptic number.

21202002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202002120 is an abundant number, since it is smaller than the sum of its proper divisors (47296779000).

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

21202002120 is a wasteful number, since it uses less digits than its factorization.

21202002120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13591054 (or 13591050 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21202002120 its reverse (2120020212), we get a palindrome (23322022332).

The spelling of 21202002120 in words is "twenty-one billion, two hundred two million, two thousand, one hundred twenty".