21301020120 has 64 divisors (see below), whose sum is σ = 65108797920. Its totient is φ = 5573095424.

The previous prime is 21301020119. The next prime is 21301020131. The reversal of 21301020120 is 2102010312.

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 = 21301020096 and 21301020105.

It is a congruent number.

It is an unprimeable number.

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, 1668249 + ... + 1680968.

Almost surely, 2^21301020120 is an apocalyptic number.

21301020120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21301020120 is an abundant number, since it is smaller than the sum of its proper divisors (43807777800).

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

21301020120 is a wasteful number, since it uses less digits than its factorization.

21301020120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3349284 (or 3349280 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21301020120 its reverse (2102010312), we get a palindrome (23403030432).

The spelling of 21301020120 in words is "twenty-one billion, three hundred one million, twenty thousand, one hundred twenty".