21211230031009 has 4 divisors (see below), whose sum is σ = 21479726613760. Its totient is φ = 20942733448260.

The previous prime is 21211230031001. The next prime is 21211230031027. The reversal of 21211230031009 is 90013003211212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21211230031009 - 2³ = 21211230031001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211230031001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134248291257 + ... + 134248291414.

It is an arithmetic number, because the mean of its divisors is an integer number (5369931653440).

Almost surely, 2^{21211230031009} is an apocalyptic number.

It is an amenable number.

21211230031009 is a deficient number, since it is larger than the sum of its proper divisors (268496582751).

21211230031009 is an equidigital number, since it uses as much as digits as its factorization.

21211230031009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268496582750.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 21211230031009 in words is "twenty-one trillion, two hundred eleven billion, two hundred thirty million, thirty-one thousand, nine".