201050990801921 has 4 divisors (see below), whose sum is σ = 216516451632852. Its totient is φ = 185585529970992.

The previous prime is 201050990801893. The next prime is 201050990801959. The reversal of 201050990801921 is 129108099050102.

201050990801921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 92326346995600 + 108724643806321 = 9608660^2 + 10427111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201050990801921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201050990801981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7732730415446 + ... + 7732730415471.

It is an arithmetic number, because the mean of its divisors is an integer number (54129112908213).

Almost surely, 2^{201050990801921} is an apocalyptic number.

It is an amenable number.

201050990801921 is a deficient number, since it is larger than the sum of its proper divisors (15465460830931).

201050990801921 is a wasteful number, since it uses less digits than its factorization.

201050990801921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15465460830930.

The product of its (nonzero) digits is 116640, while the sum is 47.

The spelling of 201050990801921 in words is "two hundred one trillion, fifty billion, nine hundred ninety million, eight hundred one thousand, nine hundred twenty-one".