1221110252 has 12 divisors (see below), whose sum is σ = 2137187976. Its totient is φ = 610485120.

The previous prime is 1221110251. The next prime is 1221110269. The reversal of 1221110252 is 2520111221.

It is a super-2 number, since 2×1221110252² = 2982220495079007008, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221110252.

It is not an unprimeable number, because it can be changed into a prime (1221110251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56663 + ... + 75185.

It is an arithmetic number, because the mean of its divisors is an integer number (178098998).

Almost surely, 2^1221110252 is an apocalyptic number.

It is an amenable number.

1221110252 is a deficient number, since it is larger than the sum of its proper divisors (916077724).

1221110252 is a wasteful number, since it uses less digits than its factorization.

1221110252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35008 (or 35006 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1221110252 is about 34944.3879900622. The cubic root of 1221110252 is about 1068.8537677388.

Adding to 1221110252 its reverse (2520111221), we get a palindrome (3741221473).

The spelling of 1221110252 in words is "one billion, two hundred twenty-one million, one hundred ten thousand, two hundred fifty-two".