1221525084 has 24 divisors (see below), whose sum is σ = 3069473680. Its totient is φ = 375853824.

The previous prime is 1221525073. The next prime is 1221525103. The reversal of 1221525084 is 4805251221.

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, 3914989 + ... + 3915300.

Almost surely, 2^1221525084 is an apocalyptic number.

It is an amenable number.

1221525084 is an abundant number, since it is smaller than the sum of its proper divisors (1847948596).

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

1221525084 is a wasteful number, since it uses less digits than its factorization.

1221525084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7830309 (or 7830307 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 1221525084 is about 34950.3230886354. The cubic root of 1221525084 is about 1068.9747899931.

The spelling of 1221525084 in words is "one billion, two hundred twenty-one million, five hundred twenty-five thousand, eighty-four".