210001021320 has 64 divisors (see below), whose sum is σ = 631574288640. Its totient is φ = 55860608000.

The previous prime is 210001021303. The next prime is 210001021361. The reversal of 210001021320 is 23120100012.

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 = 210001021296 and 210001021305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2133936 + ... + 2230175.

It is an arithmetic number, because the mean of its divisors is an integer number (9868348260).

Almost surely, 2^210001021320 is an apocalyptic number.

210001021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210001021320 is an abundant number, since it is smaller than the sum of its proper divisors (421573267320).

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

210001021320 is a wasteful number, since it uses less digits than its factorization.

210001021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4364526 (or 4364522 counting only the distinct ones).

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

Adding to 210001021320 its reverse (23120100012), we get a palindrome (233121121332).

The spelling of 210001021320 in words is "two hundred ten billion, one million, twenty-one thousand, three hundred twenty".