1221418588 has 24 divisors (see below), whose sum is σ = 2401989408. Its totient is φ = 539221056.

The previous prime is 1221418573. The next prime is 1221418619. The reversal of 1221418588 is 8858141221.

It is a super-2 number, since 2×1221418588² = 2983726734223827488, 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 1221418588.

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, 509431 + ... + 511822.

It is an arithmetic number, because the mean of its divisors is an integer number (100082892).

Almost surely, 2^1221418588 is an apocalyptic number.

It is an amenable number.

1221418588 is a deficient number, since it is larger than the sum of its proper divisors (1180570820).

1221418588 is a wasteful number, since it uses less digits than its factorization.

1221418588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021293 (or 1021291 counting only the distinct ones).

The product of its digits is 40960, while the sum is 40.

The square root of 1221418588 is about 34948.7995215859. The cubic root of 1221418588 is about 1068.9437236785.

The spelling of 1221418588 in words is "one billion, two hundred twenty-one million, four hundred eighteen thousand, five hundred eighty-eight".