101212020021 has 12 divisors (see below), whose sum is σ = 156981908832. Its totient is φ = 57835439928.

The previous prime is 101212019989. The next prime is 101212020043. The reversal of 101212020021 is 120020212101.

It is not a de Polignac number, because 101212020021 - 2⁵ = 101212019989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101212019979 and 101212020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101212020071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 344258425 + ... + 344258718.

It is an arithmetic number, because the mean of its divisors is an integer number (13081825736).

Almost surely, 2^101212020021 is an apocalyptic number.

It is an amenable number.

101212020021 is a deficient number, since it is larger than the sum of its proper divisors (55769888811).

101212020021 is an equidigital number, since it uses as much as digits as its factorization.

101212020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688517160 (or 688517153 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 101212020021 its reverse (120020212101), we get a palindrome (221232232122).

The spelling of 101212020021 in words is "one hundred one billion, two hundred twelve million, twenty thousand, twenty-one".