101221101020021 has 4 divisors (see below), whose sum is σ = 101221574161344. Its totient is φ = 101220627878700.

The previous prime is 101221101020009. The next prime is 101221101020029. The reversal of 101221101020021 is 120020101122101.

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 101221101020021 - 2¹⁴ = 101221101003637 is a prime.

It is a super-2 number, since 2×101221101020021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101221101019978 and 101221101020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221101020029) 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, 236249615 + ... + 236677676.

It is an arithmetic number, because the mean of its divisors is an integer number (25305393540336).

Almost surely, 2^{101221101020021} is an apocalyptic number.

It is an amenable number.

101221101020021 is a deficient number, since it is larger than the sum of its proper divisors (473141323).

101221101020021 is an equidigital number, since it uses as much as digits as its factorization.

101221101020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473141322.

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

Adding to 101221101020021 its reverse (120020101122101), we get a palindrome (221241202142122).

The spelling of 101221101020021 in words is "one hundred one trillion, two hundred twenty-one billion, one hundred one million, twenty thousand, twenty-one".