2100213122021 has 8 divisors (see below), whose sum is σ = 2401686902784. Its totient is φ = 1799100174960.

The previous prime is 2100213122009. The next prime is 2100213122197. The reversal of 2100213122021 is 1202213120012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2100213122021 - 2⁶ = 2100213121957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100213122521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90195950 + ... + 90219231.

It is an arithmetic number, because the mean of its divisors is an integer number (300210862848).

Almost surely, 2^{2100213122021} is an apocalyptic number.

It is an amenable number.

2100213122021 is a deficient number, since it is larger than the sum of its proper divisors (301473780763).

2100213122021 is a wasteful number, since it uses less digits than its factorization.

2100213122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180416851.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 2100213122021 its reverse (1202213120012), we get a palindrome (3302426242033).

The spelling of 2100213122021 in words is "two trillion, one hundred billion, two hundred thirteen million, one hundred twenty-two thousand, twenty-one".