101210212021 has 4 divisors (see below), whose sum is σ = 101225039500. Its totient is φ = 101195384544.

The previous prime is 101210212001. The next prime is 101210212039. The reversal of 101210212021 is 120212012101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120212012101 = 71 ⋅1693126931.

It can be written as a sum of positive squares in 2 ways, for example, as 69742999921 + 31467212100 = 264089^2 + 177390^2 .

It is a cyclic number.

It is not a de Polignac number, because 101210212021 - 2⁵ = 101210211989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101210211992 and 101210212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101210212001) 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, 7403496 + ... + 7417153.

It is an arithmetic number, because the mean of its divisors is an integer number (25306259875).

Almost surely, 2^101210212021 is an apocalyptic number.

It is an amenable number.

101210212021 is a deficient number, since it is larger than the sum of its proper divisors (14827479).

101210212021 is an equidigital number, since it uses as much as digits as its factorization.

101210212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14827478.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 101210212021 its reverse (120212012101), we get a palindrome (221422224122).

The spelling of 101210212021 in words is "one hundred one billion, two hundred ten million, two hundred twelve thousand, twenty-one".