21310001010 has 48 divisors (see below), whose sum is σ = 55554631704. Its totient is φ = 5667422976.

The previous prime is 21310001003. The next prime is 21310001021. The reversal of 21310001010 is 1010001312.

It can be written as a sum of positive squares in 4 ways, for example, as 19461087009 + 1848914001 = 139503^2 + 42999^2 .

It is a super-2 number, since 2×21310001010² (a number of 21 digits) 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 = 21310000983 and 21310001001.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 283827 + ... + 350966.

Almost surely, 2^21310001010 is an apocalyptic number.

21310001010 is an abundant number, since it is smaller than the sum of its proper divisors (34244630694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21310001010 is a wasteful number, since it uses less digits than its factorization.

21310001010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635179 (or 635176 counting only the distinct ones).

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

Adding to 21310001010 its reverse (1010001312), we get a palindrome (22320002322).

The spelling of 21310001010 in words is "twenty-one billion, three hundred ten million, one thousand, ten".