21111212010195 has 48 divisors (see below), whose sum is σ = 36827723088000. Its totient is φ = 11187228917760.

The previous prime is 21111212010193. The next prime is 21111212010223. The reversal of 21111212010195 is 59101021211112.

It is not a de Polignac number, because 21111212010195 - 2¹ = 21111212010193 is a prime.

It is a super-2 number, since 2×21111212010195² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21111212010193) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2643115 + ... + 7014875.

It is an arithmetic number, because the mean of its divisors is an integer number (767244231000).

Almost surely, 2^{21111212010195} is an apocalyptic number.

21111212010195 is a deficient number, since it is larger than the sum of its proper divisors (15716511077805).

21111212010195 is a wasteful number, since it uses less digits than its factorization.

21111212010195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4372460 (or 4372457 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 27.

The spelling of 21111212010195 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, ten thousand, one hundred ninety-five".