221121211121010 has 48 divisors (see below), whose sum is σ = 574920407167704. Its totient is φ = 58965116990976.

The previous prime is 221121211120981. The next prime is 221121211121033. The reversal of 221121211121010 is 10121112121122.

It is a happy number.

221121211121010 is a `hidden beast` number, since 2 + 211 + 21 + 211 + 1 + 210 + 10 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 197242165869849 + 23879045251161 = 14044293^2 + 4886619^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1292077 + ... + 21069216.

Almost surely, 2^{221121211121010} is an apocalyptic number.

221121211121010 is an abundant number, since it is smaller than the sum of its proper divisors (353799196046694).

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

221121211121010 is a wasteful number, since it uses less digits than its factorization.

221121211121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22471179 (or 22471176 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221121211121010 its reverse (10121112121122), we get a palindrome (231242323242132).

The spelling of 221121211121010 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, ten".