21311212095 has 24 divisors (see below), whose sum is σ = 37032511776. Its totient is φ = 11337340608.

The previous prime is 21311212067. The next prime is 21311212099. The reversal of 21311212095 is 59021211312.

It is not a de Polignac number, because 21311212095 - 2⁶ = 21311212031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311212099) 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, 578587 + ... + 614316.

It is an arithmetic number, because the mean of its divisors is an integer number (1543021324).

Almost surely, 2^21311212095 is an apocalyptic number.

21311212095 is a deficient number, since it is larger than the sum of its proper divisors (15721299681).

21311212095 is a wasteful number, since it uses less digits than its factorization.

21311212095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193311 (or 1193308 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The spelling of 21311212095 in words is "twenty-one billion, three hundred eleven million, two hundred twelve thousand, ninety-five".