21212222020120 has 32 divisors (see below), whose sum is σ = 48837441399120. Its totient is φ = 8287565811840.

The previous prime is 21212222020111. The next prime is 21212222020159. The reversal of 21212222020120 is 2102022221212.

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 7 ways as a sum of consecutive naturals, for example, 6166341891 + ... + 6166345330.

Almost surely, 2^{21212222020120} is an apocalyptic number.

21212222020120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212222020120 is an abundant number, since it is smaller than the sum of its proper divisors (27625219379000).

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

21212222020120 is a wasteful number, since it uses less digits than its factorization.

21212222020120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12332687275 (or 12332687271 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21212222020120 its reverse (2102022221212), we get a palindrome (23314244241332).

The spelling of 21212222020120 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-two million, twenty thousand, one hundred twenty".