10100000020021 has 4 divisors (see below), whose sum is σ = 10100076524512. Its totient is φ = 10099923515532.

The previous prime is 10100000019997. The next prime is 10100000020027. The reversal of 10100000020021 is 12002000000101.

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 10100000020021 - 2¹⁷ = 10099999888949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10100000019986 and 10100000020013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10100000020027) 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, 38053875 + ... + 38318368.

It is an arithmetic number, because the mean of its divisors is an integer number (2525019131128).

Almost surely, 2^{10100000020021} is an apocalyptic number.

It is an amenable number.

10100000020021 is a deficient number, since it is larger than the sum of its proper divisors (76504491).

10100000020021 is an equidigital number, since it uses as much as digits as its factorization.

10100000020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76504490.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 10100000020021 its reverse (12002000000101), we get a palindrome (22102000020122).

The spelling of 10100000020021 in words is "ten trillion, one hundred billion, twenty thousand, twenty-one".