2121022100201 has 4 divisors (see below), whose sum is σ = 2121375197952. Its totient is φ = 2120669002452.

The previous prime is 2121022100167. The next prime is 2121022100207. The reversal of 2121022100201 is 1020012201212.

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 a de Polignac number, because none of the positive numbers 2^k-2121022100201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2121022100207) 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, 176539865 + ... + 176551878.

It is an arithmetic number, because the mean of its divisors is an integer number (530343799488).

Almost surely, 2^{2121022100201} is an apocalyptic number.

It is an amenable number.

2121022100201 is a deficient number, since it is larger than the sum of its proper divisors (353097751).

2121022100201 is an equidigital number, since it uses as much as digits as its factorization.

2121022100201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353097750.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2121022100201 its reverse (1020012201212), we get a palindrome (3141034301413).

The spelling of 2121022100201 in words is "two trillion, one hundred twenty-one billion, twenty-two million, one hundred thousand, two hundred one".