21212111095 has 16 divisors (see below), whose sum is σ = 29184450048. Its totient is φ = 14498670240.

The previous prime is 21212111093. The next prime is 21212111101. The reversal of 21212111095 is 59011121212.

It is not a de Polignac number, because 21212111095 - 2¹ = 21212111093 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 (21212111093) 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, 963489 + ... + 985258.

It is an arithmetic number, because the mean of its divisors is an integer number (1824028128).

Almost surely, 2^21212111095 is an apocalyptic number.

21212111095 is a deficient number, since it is larger than the sum of its proper divisors (7972338953).

21212111095 is a wasteful number, since it uses less digits than its factorization.

21212111095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949070.

The product of its (nonzero) digits is 360, while the sum is 25.

The spelling of 21212111095 in words is "twenty-one billion, two hundred twelve million, one hundred eleven thousand, ninety-five".