2129904556 has 24 divisors (see below), whose sum is σ = 4122542480. Its totient is φ = 956463552.

The previous prime is 2129904529. The next prime is 2129904599. The reversal of 2129904556 is 6554099212.

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, 551586 + ... + 555433.

Almost surely, 2^2129904556 is an apocalyptic number.

2129904556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2129904556 is a deficient number, since it is larger than the sum of its proper divisors (1992637924).

2129904556 is a wasteful number, since it uses less digits than its factorization.

2129904556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107073 (or 1107071 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 2129904556 is about 46150.8890055219. The cubic root of 2129904556 is about 1286.6291329609.

The spelling of 2129904556 in words is "two billion, one hundred twenty-nine million, nine hundred four thousand, five hundred fifty-six".