10021557 has 16 divisors (see below), whose sum is σ = 16446080. Its totient is φ = 5285952.

The previous prime is 10021549. The next prime is 10021567. The reversal of 10021557 is 75512001.

It is not a de Polignac number, because 10021557 - 2³ = 10021549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18082 + ... + 18627.

It is an arithmetic number, because the mean of its divisors is an integer number (1027880).

Almost surely, 2^10021557 is an apocalyptic number.

It is an amenable number.

10021557 is a deficient number, since it is larger than the sum of its proper divisors (6424523).

10021557 is a wasteful number, since it uses less digits than its factorization.

10021557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36732.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 10021557 is about 3165.6842862168. The cubic root of 10021557 is about 215.5981683899.

Adding to 10021557 its reverse (75512001), we get a palindrome (85533558).

The spelling of 10021557 in words is "ten million, twenty-one thousand, five hundred fifty-seven".