21211202001210 has 64 divisors (see below), whose sum is σ = 56097747877248. Its totient is φ = 5099795253504.

The previous prime is 21211202001203. The next prime is 21211202001247. The reversal of 21211202001210 is 1210020211212.

It is a super-2 number, since 2×21211202001210² (a number of 27 digits) contains 22 as substring.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21211202001210.

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, 632398317 + ... + 632431856.

It is an arithmetic number, because the mean of its divisors is an integer number (876527310582).

Almost surely, 2^{21211202001210} is an apocalyptic number.

21211202001210 is an abundant number, since it is smaller than the sum of its proper divisors (34886545876038).

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

21211202001210 is a wasteful number, since it uses less digits than its factorization.

21211202001210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264830239.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21211202001210 its reverse (1210020211212), we get a palindrome (22421222212422).

The spelling of 21211202001210 in words is "twenty-one trillion, two hundred eleven billion, two hundred two million, one thousand, two hundred ten".