1310001021 has 48 divisors (see below), whose sum is σ = 2297692800. Its totient is φ = 703188864.

The previous prime is 1310000981. The next prime is 1310001067. The reversal of 1310001021 is 1201000131.

It is not a de Polignac number, because 1310001021 - 2²² = 1305806717 is a prime.

It is a super-2 number, since 2×1310001021² = 3432205350042084882, 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 = 1310000994 and 1310001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1310001221) 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, 57910 + ... + 77288.

It is an arithmetic number, because the mean of its divisors is an integer number (47868600).

Almost surely, 2^1310001021 is an apocalyptic number.

It is an amenable number.

1310001021 is a deficient number, since it is larger than the sum of its proper divisors (987691779).

1310001021 is a wasteful number, since it uses less digits than its factorization.

1310001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19458 (or 19455 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1310001021 is about 36193.9362462830. The cubic root of 1310001021 is about 1094.1844656286.

Adding to 1310001021 its reverse (1201000131), we get a palindrome (2511001152).

The spelling of 1310001021 in words is "one billion, three hundred ten million, one thousand, twenty-one".