21621200041210 has 32 divisors (see below), whose sum is σ = 48521342431872. Its totient is φ = 6739075337280.

The previous prime is 21621200041183. The next prime is 21621200041279. The reversal of 21621200041210 is 1214000212612.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 14039739517 + ... + 14039741056.

It is an arithmetic number, because the mean of its divisors is an integer number (1516291950996).

Almost surely, 2^{21621200041210} is an apocalyptic number.

21621200041210 is an abundant number, since it is smaller than the sum of its proper divisors (26900142390662).

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

21621200041210 is a wasteful number, since it uses less digits than its factorization.

21621200041210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28079480598.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21621200041210 its reverse (1214000212612), we get a palindrome (22835200253822).

The spelling of 21621200041210 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred million, forty-one thousand, two hundred ten".