2100212021 has 12 divisors (see below), whose sum is σ = 2146626144. Its totient is φ = 2054392200.

The previous prime is 2100211991. The next prime is 2100212029. The reversal of 2100212021 is 1202120012.

It is a happy number.

It is not a de Polignac number, because 2100212021 - 2¹⁰ = 2100210997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100211993 and 2100212011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100212029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1371026 + ... + 1372556.

It is an arithmetic number, because the mean of its divisors is an integer number (178885512).

Almost surely, 2^2100212021 is an apocalyptic number.

It is an amenable number.

2100212021 is a deficient number, since it is larger than the sum of its proper divisors (46414123).

2100212021 is an equidigital number, since it uses as much as digits as its factorization.

2100212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880 (or 1741 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2100212021 is about 45828.0702299366. The cubic root of 2100212021 is about 1280.6222603110.

Adding to 2100212021 its reverse (1202120012), we get a palindrome (3302332033).

The spelling of 2100212021 in words is "two billion, one hundred million, two hundred twelve thousand, twenty-one".