21001122212210 has 32 divisors (see below), whose sum is σ = 45743620821120. Its totient is φ = 6776832713472.

The previous prime is 21001122212153. The next prime is 21001122212327. The reversal of 21001122212210 is 1221222110012.

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 8823999740 + ... + 8824002119.

It is an arithmetic number, because the mean of its divisors is an integer number (1429488150660).

Almost surely, 2^{21001122212210} is an apocalyptic number.

21001122212210 is an abundant number, since it is smaller than the sum of its proper divisors (24742498608910).

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

21001122212210 is a wasteful number, since it uses less digits than its factorization.

21001122212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17648001890.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21001122212210 its reverse (1221222110012), we get a palindrome (22222344322222).

The spelling of 21001122212210 in words is "twenty-one trillion, one billion, one hundred twenty-two million, two hundred twelve thousand, two hundred ten".