1221011124 has 24 divisors (see below), whose sum is σ = 2849591808. Its totient is φ = 406922880.

The previous prime is 1221011107. The next prime is 1221011177. The reversal of 1221011124 is 4211101221.

It is a congruent number.

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, 108909 + ... + 119595.

It is an arithmetic number, because the mean of its divisors is an integer number (118732992).

Almost surely, 2^1221011124 is an apocalyptic number.

It is an amenable number.

1221011124 is an abundant number, since it is smaller than the sum of its proper divisors (1628580684).

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

1221011124 is a wasteful number, since it uses less digits than its factorization.

1221011124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20215 (or 20213 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1221011124 is about 34942.9695933245. The cubic root of 1221011124 is about 1068.8248442781.

Adding to 1221011124 its reverse (4211101221), we get a palindrome (5432112345).

The spelling of 1221011124 in words is "one billion, two hundred twenty-one million, eleven thousand, one hundred twenty-four".