21122031009 has 32 divisors (see below), whose sum is σ = 29641722880. Its totient is φ = 13362278400.

The previous prime is 21122031001. The next prime is 21122031031. The reversal of 21122031009 is 90013022112.

It is not a de Polignac number, because 21122031009 - 2³ = 21122031001 is a prime.

It is a super-2 number, since 2×21122031009² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122031001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 972549 + ... + 994029.

It is an arithmetic number, because the mean of its divisors is an integer number (926303840).

Almost surely, 2^21122031009 is an apocalyptic number.

It is an amenable number.

21122031009 is a deficient number, since it is larger than the sum of its proper divisors (8519691871).

21122031009 is a wasteful number, since it uses less digits than its factorization.

21122031009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21721.

The product of its (nonzero) digits is 216, while the sum is 21.

The spelling of 21122031009 in words is "twenty-one billion, one hundred twenty-two million, thirty-one thousand, nine".