21312001010 has 32 divisors (see below), whose sum is σ = 39296454912. Its totient is φ = 8318154240.

The previous prime is 21312001003. The next prime is 21312001019. The reversal of 21312001010 is 1010021312.

It is a junction number, because it is equal to n+sod(n) for n = 21312000982 and 21312001000.

It is not an unprimeable number, because it can be changed into a prime (21312001019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87074 + ... + 224066.

It is an arithmetic number, because the mean of its divisors is an integer number (1228014216).

Almost surely, 2^21312001010 is an apocalyptic number.

21312001010 is a deficient number, since it is larger than the sum of its proper divisors (17984453902).

21312001010 is a wasteful number, since it uses less digits than its factorization.

21312001010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137378.

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

Adding to 21312001010 its reverse (1010021312), we get a palindrome (22322022322).

The spelling of 21312001010 in words is "twenty-one billion, three hundred twelve million, one thousand, ten".