210201109999961 has 4 divisors (see below), whose sum is σ = 210211865845632. Its totient is φ = 210190354154292.

The previous prime is 210201109999957. The next prime is 210201110000009. The reversal of 210201109999961 is 169999901102012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210201109999961 - 2² = 210201109999957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210201109999961.

It is not an unprimeable number, because it can be changed into a prime (210201109999861) 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, 5377893521 + ... + 5377932606.

It is an arithmetic number, because the mean of its divisors is an integer number (52552966461408).

Almost surely, 2^{210201109999961} is an apocalyptic number.

It is an amenable number.

210201109999961 is a deficient number, since it is larger than the sum of its proper divisors (10755845671).

210201109999961 is a wasteful number, since it uses less digits than its factorization.

210201109999961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10755845670.

The product of its (nonzero) digits is 1417176, while the sum is 59.

The spelling of 210201109999961 in words is "two hundred ten trillion, two hundred one billion, one hundred nine million, nine hundred ninety-nine thousand, nine hundred sixty-one".