21101210196 has 24 divisors (see below), whose sum is σ = 53712171744. Its totient is φ = 6394306080.

The previous prime is 21101210189. The next prime is 21101210201. The reversal of 21101210196 is 69101210112.

It is a happy number.

It is a super-2 number, since 2×21101210196² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79928695 + ... + 79928958.

It is an arithmetic number, because the mean of its divisors is an integer number (2238007156).

Almost surely, 2^21101210196 is an apocalyptic number.

It is an amenable number.

21101210196 is an abundant number, since it is smaller than the sum of its proper divisors (32610961548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21101210196 is a wasteful number, since it uses less digits than its factorization.

21101210196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159857671 (or 159857669 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 24.

The spelling of 21101210196 in words is "twenty-one billion, one hundred one million, two hundred ten thousand, one hundred ninety-six".