2131021553 has 24 divisors (see below), whose sum is σ = 2370550848. Its totient is φ = 1911672576.

The previous prime is 2131021547. The next prime is 2131021577. The reversal of 2131021553 is 3551201312.

It is a happy number.

It is not a de Polignac number, because 2131021553 - 2⁴ = 2131021537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131020553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3476075 + ... + 3476687.

It is an arithmetic number, because the mean of its divisors is an integer number (98772952).

Almost surely, 2^2131021553 is an apocalyptic number.

2131021553 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2131021553 is a deficient number, since it is larger than the sum of its proper divisors (239529295).

2131021553 is a wasteful number, since it uses less digits than its factorization.

2131021553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193 (or 1176 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 2131021553 is about 46162.9889955146. The cubic root of 2131021553 is about 1286.8540115387.

Adding to 2131021553 its reverse (3551201312), we get a palindrome (5682222865).

The spelling of 2131021553 in words is "two billion, one hundred thirty-one million, twenty-one thousand, five hundred fifty-three".