21211122201210 has 48 divisors (see below), whose sum is σ = 55152623224296. Its totient is φ = 5655919202304.

The previous prime is 21211122201161. The next prime is 21211122201233. The reversal of 21211122201210 is 1210222111212.

21211122201210 is a `hidden beast` number, since 2 + 121 + 112 + 220 + 1 + 210 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 14625324030249 + 6585798170961 = 3824307^2 + 2566281^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6569559 + ... + 9251018.

Almost surely, 2^{21211122201210} is an apocalyptic number.

21211122201210 is an abundant number, since it is smaller than the sum of its proper divisors (33941501023086).

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

21211122201210 is a wasteful number, since it uses less digits than its factorization.

21211122201210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15835487 (or 15835484 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21211122201210 its reverse (1210222111212), we get a palindrome (22421344312422).

The spelling of 21211122201210 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-two million, two hundred one thousand, two hundred ten".