21030213210 has 64 divisors (see below), whose sum is σ = 51074924544. Its totient is φ = 5541480000.

The previous prime is 21030213151. The next prime is 21030213221. The reversal of 21030213210 is 1231203012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21030213210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 945315 + ... + 967305.

It is an arithmetic number, because the mean of its divisors is an integer number (798045696).

Almost surely, 2^21030213210 is an apocalyptic number.

21030213210 is an abundant number, since it is smaller than the sum of its proper divisors (30044711334).

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

21030213210 is a wasteful number, since it uses less digits than its factorization.

21030213210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22379.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21030213210 its reverse (1231203012), we get a palindrome (22261416222).

The spelling of 21030213210 in words is "twenty-one billion, thirty million, two hundred thirteen thousand, two hundred ten".