101121210021 has 16 divisors (see below), whose sum is σ = 148576425536. Its totient is φ = 60781262976.

The previous prime is 101121210013. The next prime is 101121210023. The reversal of 101121210021 is 120012121101.

It is not a de Polignac number, because 101121210021 - 2³ = 101121210013 is a prime.

It is a super-2 number, since 2×101121210021² (a number of 23 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 = 101121209979 and 101121210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101121210023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30147760 + ... + 30151113.

It is an arithmetic number, because the mean of its divisors is an integer number (9286026596).

Almost surely, 2^101121210021 is an apocalyptic number.

It is an amenable number.

101121210021 is a deficient number, since it is larger than the sum of its proper divisors (47455215515).

101121210021 is a wasteful number, since it uses less digits than its factorization.

101121210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60298932.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 101121210021 its reverse (120012121101), we get a palindrome (221133331122).

The spelling of 101121210021 in words is "one hundred one billion, one hundred twenty-one million, two hundred ten thousand, twenty-one".