2310000021 has 48 divisors (see below), whose sum is σ = 3926991744. Its totient is φ = 1280852352.

The previous prime is 2309999969. The next prime is 2310000023. The reversal of 2310000021 is 1200000132.

It is a happy number.

It is not a de Polignac number, because 2310000021 - 2⁹ = 2309999509 is a prime.

It is a super-2 number, since 2×2310000021² = 10672200194040000882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2309999958 and 2310000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2310000023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1031515 + ... + 1033751.

It is an arithmetic number, because the mean of its divisors is an integer number (81812328).

Almost surely, 2^2310000021 is an apocalyptic number.

2310000021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2310000021 is a deficient number, since it is larger than the sum of its proper divisors (1616991723).

2310000021 is a wasteful number, since it uses less digits than its factorization.

2310000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730 (or 2727 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 2310000021 is about 48062.4595812574. The cubic root of 2310000021 is about 1321.9164122901.

Adding to 2310000021 its reverse (1200000132), we get a palindrome (3510000153).

The spelling of 2310000021 in words is "two billion, three hundred ten million, twenty-one", and thus it is an aban number.