10000021101221 has 4 divisors (see below), whose sum is σ = 10097108684832. Its totient is φ = 9902933517612.

The previous prime is 10000021101209. The next prime is 10000021101251. The reversal of 10000021101221 is 12210112000001.

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 a de Polignac number, because none of the positive numbers 2^k-10000021101221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000021101251) 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, 48543791651 + ... + 48543791856.

It is an arithmetic number, because the mean of its divisors is an integer number (2524277171208).

Almost surely, 2^{10000021101221} is an apocalyptic number.

It is an amenable number.

10000021101221 is a deficient number, since it is larger than the sum of its proper divisors (97087583611).

10000021101221 is an equidigital number, since it uses as much as digits as its factorization.

10000021101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97087583610.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10000021101221 its reverse (12210112000001), we get a palindrome (22210133101222).

The spelling of 10000021101221 in words is "ten trillion, twenty-one million, one hundred one thousand, two hundred twenty-one".