101221121021 has 4 divisors (see below), whose sum is σ = 101526925344. Its totient is φ = 100915316700.

The previous prime is 101221121011. The next prime is 101221121033. The reversal of 101221121021 is 120121122101.

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-101221121021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101221120987 and 101221121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221121011) 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, 152901665 + ... + 152902326.

It is an arithmetic number, because the mean of its divisors is an integer number (25381731336).

Almost surely, 2^101221121021 is an apocalyptic number.

It is an amenable number.

101221121021 is a deficient number, since it is larger than the sum of its proper divisors (305804323).

101221121021 is an equidigital number, since it uses as much as digits as its factorization.

101221121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305804322.

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

Adding to 101221121021 its reverse (120121122101), we get a palindrome (221342243122).

It can be divided in two parts, 101 and 221121021, that added together give a palindrome (221121122).

The spelling of 101221121021 in words is "one hundred one billion, two hundred twenty-one million, one hundred twenty-one thousand, twenty-one".