21202220022012 has 72 divisors (see below), whose sum is σ = 56424841309200. Its totient is φ = 6694301230848.

The previous prime is 21202220021963. The next prime is 21202220022097. The reversal of 21202220022012 is 21022002220212.

21202220022012 is a `hidden beast` number, since 21 + 202 + 220 + 0 + 220 + 1 + 2 = 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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1405314 + ... + 6661782.

Almost surely, 2^{21202220022012} is an apocalyptic number.

It is an amenable number.

21202220022012 is an abundant number, since it is smaller than the sum of its proper divisors (35222621287188).

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

21202220022012 is a wasteful number, since it uses less digits than its factorization.

21202220022012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5262395 (or 5262390 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21202220022012 its reverse (21022002220212), we get a palindrome (42224222242224).

The spelling of 21202220022012 in words is "twenty-one trillion, two hundred two billion, two hundred twenty million, twenty-two thousand, twelve".