2100020202121 has 4 divisors (see below), whose sum is σ = 2210547581200. Its totient is φ = 1989492823044.

The previous prime is 2100020202109. The next prime is 2100020202167. The reversal of 2100020202121 is 1212020200012.

It is a happy number.

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-2100020202121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100020202421) 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, 55263689511 + ... + 55263689548.

It is an arithmetic number, because the mean of its divisors is an integer number (552636895300).

Almost surely, 2^{2100020202121} is an apocalyptic number.

It is an amenable number.

2100020202121 is a deficient number, since it is larger than the sum of its proper divisors (110527379079).

2100020202121 is a wasteful number, since it uses less digits than its factorization.

2100020202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110527379078.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2100020202121 its reverse (1212020200012), we get a palindrome (3312040402133).

The spelling of 2100020202121 in words is "two trillion, one hundred billion, twenty million, two hundred two thousand, one hundred twenty-one".