21210020001210 has 32 divisors (see below), whose sum is σ = 50915243414592. Its totient is φ = 5654761399040.

The previous prime is 21210020001187. The next prime is 21210020001217. The reversal of 21210020001210 is 1210002001212.

It is not an unprimeable number, because it can be changed into a prime (21210020001217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77607231 + ... + 77880050.

It is an arithmetic number, because the mean of its divisors is an integer number (1591101356706).

Almost surely, 2^{21210020001210} is an apocalyptic number.

21210020001210 is an abundant number, since it is smaller than the sum of its proper divisors (29705223413382).

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

21210020001210 is a wasteful number, since it uses less digits than its factorization.

21210020001210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155491838.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21210020001210 its reverse (1210002001212), we get a palindrome (22420022002422).

The spelling of 21210020001210 in words is "twenty-one trillion, two hundred ten billion, twenty million, one thousand, two hundred ten".