21202220101212 has 48 divisors (see below), whose sum is σ = 54969098419200. Its totient is φ = 7067357889840.

The previous prime is 21202220101171. The next prime is 21202220101267. The reversal of 21202220101212 is 21210102220212.

It is a happy number.

21202220101212 is a `hidden beast` number, since 21 + 202 + 220 + 10 + 1 + 212 = 666.

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

It is a congruent number.

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, 17206239 + ... + 18397257.

It is an arithmetic number, because the mean of its divisors is an integer number (1145189550400).

Almost surely, 2^{21202220101212} is an apocalyptic number.

It is an amenable number.

21202220101212 is an abundant number, since it is smaller than the sum of its proper divisors (33766878317988).

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

21202220101212 is a wasteful number, since it uses less digits than its factorization.

21202220101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355863 (or 1355855 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21202220101212 its reverse (21210102220212), we get a palindrome (42412322321424).

The spelling of 21202220101212 in words is "twenty-one trillion, two hundred two billion, two hundred twenty million, one hundred one thousand, two hundred twelve".