1221512152 has 64 divisors (see below), whose sum is σ = 2892049920. Its totient is φ = 471280128.

The previous prime is 1221512099. The next prime is 1221512153. The reversal of 1221512152 is 2512151221.

It is a happy number.

It is a super-2 number, since 2×1221512152² = 2984183874967342208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221512153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5998 + ... + 49789.

It is an arithmetic number, because the mean of its divisors is an integer number (45188280).

Almost surely, 2^1221512152 is an apocalyptic number.

It is an amenable number.

1221512152 is an abundant number, since it is smaller than the sum of its proper divisors (1670537768).

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

1221512152 is a wasteful number, since it uses less digits than its factorization.

1221512152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55840 (or 55836 counting only the distinct ones).

The product of its digits is 400, while the sum is 22.

The square root of 1221512152 is about 34950.1380827029. The cubic root of 1221512152 is about 1068.9710176512.

Adding to 1221512152 its reverse (2512151221), we get a palindrome (3733663373).

The spelling of 1221512152 in words is "one billion, two hundred twenty-one million, five hundred twelve thousand, one hundred fifty-two".