221021221011012 has 24 divisors (see below), whose sum is σ = 573017980399200. Its totient is φ = 73673740336968.

The previous prime is 221021221010963. The next prime is 221021221011013. The reversal of 221021221011012 is 210110122120122.

221021221011012 is a `hidden beast` number, since 221 + 0 + 212 + 210 + 1 + 10 + 12 = 666.

It is a super-2 number, since 2×221021221011012² (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 not an unprimeable number, because it can be changed into a prime (221021221011013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1023246393462 + ... + 1023246393677.

It is an arithmetic number, because the mean of its divisors is an integer number (23875749183300).

Almost surely, 2^{221021221011012} is an apocalyptic number.

It is an amenable number.

221021221011012 is an abundant number, since it is smaller than the sum of its proper divisors (351996759388188).

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

221021221011012 is a wasteful number, since it uses less digits than its factorization.

221021221011012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046492787152 (or 2046492787144 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221021221011012 its reverse (210110122120122), we get a palindrome (431131343131134).

The spelling of 221021221011012 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, eleven thousand, twelve".