21211012220212 has 24 divisors (see below), whose sum is σ = 38320728750080. Its totient is φ = 10262305104480.

The previous prime is 21211012220201. The next prime is 21211012220231. The reversal of 21211012220212 is 21202221011212.

It is a self number, because there is not a number n which added to its sum of digits gives 21211012220212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7890723 + ... + 10231594.

Almost surely, 2^{21211012220212} is an apocalyptic number.

It is an amenable number.

21211012220212 is a deficient number, since it is larger than the sum of its proper divisors (17109716529868).

21211012220212 is a wasteful number, since it uses less digits than its factorization.

21211012220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18131791 (or 18131789 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21211012220212 its reverse (21202221011212), we get a palindrome (42413233231424).

The spelling of 21211012220212 in words is "twenty-one trillion, two hundred eleven billion, twelve million, two hundred twenty thousand, two hundred twelve".