2100020312021 has 4 divisors (see below), whose sum is σ = 2100028308000. Its totient is φ = 2100012316044.

The previous prime is 2100020312009. The next prime is 2100020312029. The reversal of 2100020312021 is 1202130200012.

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 not a de Polignac number, because 2100020312021 - 2⁶ = 2100020311957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100020311987 and 2100020312005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100020312029) 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, 3590171 + ... + 4133928.

It is an arithmetic number, because the mean of its divisors is an integer number (525007077000).

Almost surely, 2^{2100020312021} is an apocalyptic number.

It is an amenable number.

2100020312021 is a deficient number, since it is larger than the sum of its proper divisors (7995979).

2100020312021 is an equidigital number, since it uses as much as digits as its factorization.

2100020312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7995978.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 2100020312021 its reverse (1202130200012), we get a palindrome (3302150512033).

The spelling of 2100020312021 in words is "two trillion, one hundred billion, twenty million, three hundred twelve thousand, twenty-one".