221102121000 has 128 divisors (see below), whose sum is σ = 708483260160. Its totient is φ = 57367008000.

The previous prime is 221102120983. The next prime is 221102121073. The reversal of 221102121000 is 121201122.

It is a super-2 number, since 2×221102121000² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 884956 + ... + 1106955.

It is an arithmetic number, because the mean of its divisors is an integer number (5535025470).

Almost surely, 2^221102121000 is an apocalyptic number.

221102121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221102121000 is an abundant number, since it is smaller than the sum of its proper divisors (487381139160).

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

221102121000 is a wasteful number, since it uses less digits than its factorization.

221102121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991972 (or 1991958 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221102121000 its reverse (121201122), we get a palindrome (221223322122).

The spelling of 221102121000 in words is "two hundred twenty-one billion, one hundred two million, one hundred twenty-one thousand".