2102012100021 has 8 divisors (see below), whose sum is σ = 2803015575360. Its totient is φ = 1401175012352.

The previous prime is 2102012100007. The next prime is 2102012100037. The reversal of 2102012100021 is 1200012102012.

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 2102012100021 - 2¹⁷ = 2102011968949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102012200021) 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, 41567436 + ... + 41617973.

It is an arithmetic number, because the mean of its divisors is an integer number (350376946920).

Almost surely, 2^{2102012100021} is an apocalyptic number.

It is an amenable number.

2102012100021 is a deficient number, since it is larger than the sum of its proper divisors (701003475339).

2102012100021 is an equidigital number, since it uses as much as digits as its factorization.

2102012100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83193835.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 2102012100021 its reverse (1200012102012), we get a palindrome (3302024202033).

The spelling of 2102012100021 in words is "two trillion, one hundred two billion, twelve million, one hundred thousand, twenty-one".