56129821 has 16 divisors (see below), whose sum is σ = 64960128. Its totient is φ = 47995200.

The previous prime is 56129803. The next prime is 56129833. The reversal of 56129821 is 12892165.

It is not a de Polignac number, because 56129821 - 2⁷ = 56129693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56129881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13615 + ... + 17251.

It is an arithmetic number, because the mean of its divisors is an integer number (4060008).

Almost surely, 2^56129821 is an apocalyptic number.

It is an amenable number.

56129821 is a deficient number, since it is larger than the sum of its proper divisors (8830307).

56129821 is a wasteful number, since it uses less digits than its factorization.

56129821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3732.

The product of its digits is 8640, while the sum is 34.

The square root of 56129821 is about 7491.9837826840. The cubic root of 56129821 is about 382.8816496302.

The spelling of 56129821 in words is "fifty-six million, one hundred twenty-nine thousand, eight hundred twenty-one".