21211331213309 has 16 divisors (see below), whose sum is σ = 22339423233792. Its totient is φ = 20100554842368.

The previous prime is 21211331213239. The next prime is 21211331213323. The reversal of 21211331213309 is 90331213311212.

It is a cyclic number.

It is not a de Polignac number, because 21211331213309 - 2⁴⁴ = 3619145168893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211331213509) 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, 3989792 + ... + 7638134.

It is an arithmetic number, because the mean of its divisors is an integer number (1396213952112).

Almost surely, 2^{21211331213309} is an apocalyptic number.

It is an amenable number.

21211331213309 is a deficient number, since it is larger than the sum of its proper divisors (1128092020483).

21211331213309 is a wasteful number, since it uses less digits than its factorization.

21211331213309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3650716.

The product of its (nonzero) digits is 5832, while the sum is 32.

The spelling of 21211331213309 in words is "twenty-one trillion, two hundred eleven billion, three hundred thirty-one million, two hundred thirteen thousand, three hundred nine".