221201011021000 has 32 divisors (see below), whose sum is σ = 517610365791480. Its totient is φ = 88480404408000.

The previous prime is 221201011020943. The next prime is 221201011021013. The reversal of 221201011021000 is 120110102122.

It can be written as a sum of positive squares in 4 ways, for example, as 13937364625284 + 207263646395716 = 3733278^2 + 14396654^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110600504511 + ... + 110600506510.

Almost surely, 2^{221201011021000} is an apocalyptic number.

221201011021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201011021000 is an abundant number, since it is smaller than the sum of its proper divisors (296409354770480).

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

221201011021000 is a wasteful number, since it uses less digits than its factorization.

221201011021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221201011042 (or 221201011028 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221201011021000 its reverse (120110102122), we get a palindrome (221321121123122).

The spelling of 221201011021000 in words is "two hundred twenty-one trillion, two hundred one billion, eleven million, twenty-one thousand".