21101310009 has 24 divisors (see below), whose sum is σ = 32833192392. Its totient is φ = 12981888000.

The previous prime is 21101310001. The next prime is 21101310011. The reversal of 21101310009 is 90001310112.

It can be written as a sum of positive squares in 4 ways, for example, as 70509609 + 21030800400 = 8397^2 + 145020^2 .

It is not a de Polignac number, because 21101310009 - 2³ = 21101310001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21101309973 and 21101310000.

It is not an unprimeable number, because it can be changed into a prime (21101310001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 445579 + ... + 490655.

It is an arithmetic number, because the mean of its divisors is an integer number (1368049683).

Almost surely, 2^21101310009 is an apocalyptic number.

It is an amenable number.

21101310009 is a deficient number, since it is larger than the sum of its proper divisors (11731882383).

21101310009 is a wasteful number, since it uses less digits than its factorization.

21101310009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49097 (or 49094 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The spelling of 21101310009 in words is "twenty-one billion, one hundred one million, three hundred ten thousand, nine".