1310000021 has 8 divisors (see below), whose sum is σ = 1429524288. Its totient is φ = 1190548000.

The previous prime is 1310000017. The next prime is 1310000051. The reversal of 1310000021 is 1200000131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1310000021 - 2² = 1310000017 is a prime.

It is a super-2 number, since 2×1310000021² = 3432200110040000882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1309999963 and 1310000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1310000051) 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 7 ways as a sum of consecutive naturals, for example, 24161 + ... + 56601.

It is an arithmetic number, because the mean of its divisors is an integer number (178690536).

Almost surely, 2^1310000021 is an apocalyptic number.

1310000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1310000021 is a deficient number, since it is larger than the sum of its proper divisors (119524267).

1310000021 is a wasteful number, since it uses less digits than its factorization.

1310000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36123.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 1310000021 is about 36193.9224318117. The cubic root of 1310000021 is about 1094.1841872103.

Adding to 1310000021 its reverse (1200000131), we get a palindrome (2510000152).

The spelling of 1310000021 in words is "one billion, three hundred ten million, twenty-one", and thus it is an aban number.