21310001012 has 12 divisors (see below), whose sum is σ = 37302940836. Its totient is φ = 10652017920.

The previous prime is 21310001003. The next prime is 21310001021. The reversal of 21310001012 is 21010001312.

It is an interprime number because it is at equal distance from previous prime (21310001003) and next prime (21310001021).

It can be written as a sum of positive squares in 2 ways, for example, as 19677356176 + 1632644836 = 140276^2 + 40406^2 .

It is a super-2 number, since 2×21310001012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21310000984 and 21310001002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 729533 + ... + 758180.

It is an arithmetic number, because the mean of its divisors is an integer number (3108578403).

Almost surely, 2^21310001012 is an apocalyptic number.

It is an amenable number.

21310001012 is a deficient number, since it is larger than the sum of its proper divisors (15992939824).

21310001012 is a wasteful number, since it uses less digits than its factorization.

21310001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491298 (or 1491296 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21310001012 its reverse (21010001312), we get a palindrome (42320002324).

The spelling of 21310001012 in words is "twenty-one billion, three hundred ten million, one thousand, twelve".