221220121010 has 32 divisors (see below), whose sum is σ = 455380417152. Its totient is φ = 75797061120.

The previous prime is 221220121009. The next prime is 221220121027. The reversal of 221220121010 is 10121022122.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 930911 + ... + 1144130.

It is an arithmetic number, because the mean of its divisors is an integer number (14230638036).

Almost surely, 2^221220121010 is an apocalyptic number.

221220121010 is an abundant number, since it is smaller than the sum of its proper divisors (234160296142).

221220121010 is a wasteful number, since it uses less digits than its factorization.

221220121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2076578.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221220121010 its reverse (10121022122), we get a palindrome (231341143132).

The spelling of 221220121010 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, ten".