1337221921 has 64 divisors (see below), whose sum is σ = 1750339584. Its totient is φ = 995328000.

The previous prime is 1337221883. The next prime is 1337221927. The reversal of 1337221921 is 1291227331.

It is a 5-Lehmer number, since φ(1337221921) divides (1337221921-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 1337221921 - 2⁹ = 1337221409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a deceptive number, since it divides R_1337221920.

It is not an unprimeable number, because it can be changed into a prime (1337221927) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13239771 + ... + 13239871.

It is an arithmetic number, because the mean of its divisors is an integer number (27349056).

Almost surely, 2^1337221921 is an apocalyptic number.

It is an amenable number.

1337221921 is a deficient number, since it is larger than the sum of its proper divisors (413117663).

1337221921 is a wasteful number, since it uses less digits than its factorization.

1337221921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290.

The product of its digits is 4536, while the sum is 31.

The square root of 1337221921 is about 36568.0450803704. The cubic root of 1337221921 is about 1101.7113639279.

The spelling of 1337221921 in words is "one billion, three hundred thirty-seven million, two hundred twenty-one thousand, nine hundred twenty-one".