21010121112195 has 32 divisors (see below), whose sum is σ = 37353428259840. Its totient is φ = 11204767375200.

The previous prime is 21010121112193. The next prime is 21010121112203. The reversal of 21010121112195 is 59121112101012.

It is not a de Polignac number, because 21010121112195 - 2¹ = 21010121112193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21010121112193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1965981 + ... + 6773870.

It is an arithmetic number, because the mean of its divisors is an integer number (1167294633120).

Almost surely, 2^{21010121112195} is an apocalyptic number.

21010121112195 is a deficient number, since it is larger than the sum of its proper divisors (16343307147645).

21010121112195 is a wasteful number, since it uses less digits than its factorization.

21010121112195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8757672 (or 8757666 counting only the distinct ones).

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

The spelling of 21010121112195 in words is "twenty-one trillion, ten billion, one hundred twenty-one million, one hundred twelve thousand, one hundred ninety-five".