2121057690 has 32 divisors (see below), whose sum is σ = 5091750720. Its totient is φ = 565480704.

The previous prime is 2121057667. The next prime is 2121057707. The reversal of 2121057690 is 967501212.

It is a super-2 number, since 2×2121057690² = 8997771448616272200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236101 + ... + 244919.

It is an arithmetic number, because the mean of its divisors is an integer number (159117210).

Almost surely, 2^2121057690 is an apocalyptic number.

2121057690 is an abundant number, since it is smaller than the sum of its proper divisors (2970693030).

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

2121057690 is a wasteful number, since it uses less digits than its factorization.

2121057690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16846.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 2121057690 is about 46054.9420800852. The cubic root of 2121057690 is about 1284.8452608818.

The spelling of 2121057690 in words is "two billion, one hundred twenty-one million, fifty-seven thousand, six hundred ninety".