10121221210021 has 4 divisors (see below), whose sum is σ = 10653917063200. Its totient is φ = 9588525356844.

The previous prime is 10121221209971. The next prime is 10121221210033. The reversal of 10121221210021 is 12001212212101.

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 10121221210021 - 2¹⁷ = 10121221078949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10121221209977 and 10121221210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121221210081) 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, 266347926561 + ... + 266347926598.

It is an arithmetic number, because the mean of its divisors is an integer number (2663479265800).

Almost surely, 2^{10121221210021} is an apocalyptic number.

It is an amenable number.

10121221210021 is a deficient number, since it is larger than the sum of its proper divisors (532695853179).

10121221210021 is an equidigital number, since it uses as much as digits as its factorization.

10121221210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532695853178.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 10121221210021 its reverse (12001212212101), we get a palindrome (22122433422122).

The spelling of 10121221210021 in words is "ten trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred ten thousand, twenty-one".