21221212095 has 24 divisors (see below), whose sum is σ = 37127213136. Its totient is φ = 11212201728.

The previous prime is 21221212079. The next prime is 21221212109. The reversal of 21221212095 is 59021212212.

It is a happy number.

It is not a de Polignac number, because 21221212095 - 2⁴ = 21221212079 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2198842 + ... + 2208471.

It is an arithmetic number, because the mean of its divisors is an integer number (1546967214).

Almost surely, 2^21221212095 is an apocalyptic number.

21221212095 is a deficient number, since it is larger than the sum of its proper divisors (15906001041).

21221212095 is a wasteful number, since it uses less digits than its factorization.

21221212095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4407431 (or 4407428 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 21221212095 in words is "twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, ninety-five".