21011201220212 has 48 divisors (see below), whose sum is σ = 42077836050432. Its totient is φ = 8992923821280.

The previous prime is 21011201220187. The next prime is 21011201220227. The reversal of 21011201220212 is 21202210211012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321126533 + ... + 321191955.

It is an arithmetic number, because the mean of its divisors is an integer number (876621584384).

Almost surely, 2^{21011201220212} is an apocalyptic number.

It is an amenable number.

21011201220212 is an abundant number, since it is smaller than the sum of its proper divisors (21066634830220).

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

21011201220212 is a wasteful number, since it uses less digits than its factorization.

21011201220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80388 (or 80386 counting only the distinct ones).

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

Adding to 21011201220212 its reverse (21202210211012), we get a palindrome (42213411431224).

The spelling of 21011201220212 in words is "twenty-one trillion, eleven billion, two hundred one million, two hundred twenty thousand, two hundred twelve".