2100021357 has 16 divisors (see below), whose sum is σ = 3209109120. Its totient is φ = 1196608512.

The previous prime is 2100021331. The next prime is 2100021367. The reversal of 2100021357 is 7531200012.

It is not a de Polignac number, because 2100021357 - 2⁶ = 2100021293 is a prime.

It is a super-2 number, since 2×2100021357² = 8820179399712242898, which contains 22 as substring.

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 (2100021317) 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, 134232 + ... + 149057.

It is an arithmetic number, because the mean of its divisors is an integer number (200569320).

Almost surely, 2^2100021357 is an apocalyptic number.

It is an amenable number.

2100021357 is a deficient number, since it is larger than the sum of its proper divisors (1109087763).

2100021357 is a wasteful number, since it uses less digits than its factorization.

2100021357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283652.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 2100021357 is about 45825.9899729400. The cubic root of 2100021357 is about 1280.5835061361.

Adding to 2100021357 its reverse (7531200012), we get a palindrome (9631221369).

The spelling of 2100021357 in words is "two billion, one hundred million, twenty-one thousand, three hundred fifty-seven".