221220120021012 has 144 divisors (see below), whose sum is σ = 662766889715840. Its totient is φ = 63204136797312.

The previous prime is 221220120020983. The next prime is 221220120021049. The reversal of 221220120021012 is 210120021022122.

It is a happy number.

221220120021012 is a `hidden beast` number, since 2 + 21 + 220 + 1 + 200 + 210 + 12 = 666.

It is a super-2 number, since 2×221220120021012² (a number of 29 digits) contains 22 as substring.

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 47 ways as a sum of consecutive naturals, for example, 280400358 + ... + 281188194.

Almost surely, 2^{221220120021012} is an apocalyptic number.

It is an amenable number.

221220120021012 is an abundant number, since it is smaller than the sum of its proper divisors (441546769694828).

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

221220120021012 is a wasteful number, since it uses less digits than its factorization.

221220120021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829132 (or 829118 counting only the distinct ones).

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

Adding to 221220120021012 its reverse (210120021022122), we get a palindrome (431340141043134).

The spelling of 221220120021012 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred twenty million, twenty-one thousand, twelve".