10122100021 has 4 divisors (see below), whose sum is σ = 11042290944. Its totient is φ = 9201909100.

The previous prime is 10122099991. The next prime is 10122100031. The reversal of 10122100021 is 12000122101.

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 10122100021 - 2²⁵ = 10088545589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10122099980 and 10122100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10122100031) 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, 460095445 + ... + 460095466.

It is an arithmetic number, because the mean of its divisors is an integer number (2760572736).

Almost surely, 2^10122100021 is an apocalyptic number.

10122100021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10122100021 is a deficient number, since it is larger than the sum of its proper divisors (920190923).

10122100021 is an equidigital number, since it uses as much as digits as its factorization.

10122100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920190922.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 10122100021 its reverse (12000122101), we get a palindrome (22122222122).

It can be divided in two parts, 101 and 22100021, that added together give a palindrome (22100122).

The spelling of 10122100021 in words is "ten billion, one hundred twenty-two million, one hundred thousand, twenty-one".