101212010021 has 4 divisors (see below), whose sum is σ = 101272726752. Its totient is φ = 101151293292.

The previous prime is 101212010017. The next prime is 101212010057. The reversal of 101212010021 is 120010212101.

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 101212010021 - 2² = 101212010017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101212009984 and 101212010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101212010521) 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, 30355865 + ... + 30359198.

It is an arithmetic number, because the mean of its divisors is an integer number (25318181688).

Almost surely, 2^101212010021 is an apocalyptic number.

It is an amenable number.

101212010021 is a deficient number, since it is larger than the sum of its proper divisors (60716731).

101212010021 is an equidigital number, since it uses as much as digits as its factorization.

101212010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60716730.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 101212010021 its reverse (120010212101), we get a palindrome (221222222122).

The spelling of 101212010021 in words is "one hundred one billion, two hundred twelve million, ten thousand, twenty-one".