10122121100021 has 4 divisors (see below), whose sum is σ = 11568138400032. Its totient is φ = 8676103800012.

The previous prime is 10122121099963. The next prime is 10122121100027. The reversal of 10122121100021 is 12000112122101.

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 10122121100021 - 2²⁶ = 10122053991157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10122121099969 and 10122121100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10122121100027) 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, 723008649995 + ... + 723008650008.

It is an arithmetic number, because the mean of its divisors is an integer number (2892034600008).

Almost surely, 2^{10122121100021} is an apocalyptic number.

It is an amenable number.

10122121100021 is a deficient number, since it is larger than the sum of its proper divisors (1446017300011).

10122121100021 is an equidigital number, since it uses as much as digits as its factorization.

10122121100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446017300010.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 10122121100021 its reverse (12000112122101), we get a palindrome (22122233222122).

The spelling of 10122121100021 in words is "ten trillion, one hundred twenty-two billion, one hundred twenty-one million, one hundred thousand, twenty-one".