101221000021 has 8 divisors (see below), whose sum is σ = 101414109888. Its totient is φ = 101028060000.

The previous prime is 101221000009. The next prime is 101221000037. The reversal of 101221000021 is 120000122101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101221000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101220999971 and 101221000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221000061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1184121 + ... + 1266721.

It is an arithmetic number, because the mean of its divisors is an integer number (12676763736).

Almost surely, 2^101221000021 is an apocalyptic number.

It is an amenable number.

101221000021 is a deficient number, since it is larger than the sum of its proper divisors (193109867).

101221000021 is an equidigital number, since it uses as much as digits as its factorization.

101221000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84923.

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

Adding to 101221000021 its reverse (120000122101), we get a palindrome (221221122122).

It can be divided in two parts, 101 and 221000021, that added together give a palindrome (221000122).

The spelling of 101221000021 in words is "one hundred one billion, two hundred twenty-one million, twenty-one", and thus it is an aban number.