101212021 has 4 divisors (see below), whose sum is σ = 101292192. Its totient is φ = 101131852.

The previous prime is 101212019. The next prime is 101212037. The reversal of 101212021 is 120212101.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120212101 = 607 ⋅198043.

It is a cyclic number.

It is not a de Polignac number, because 101212021 - 2¹ = 101212019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101211989 and 101212007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101212051) 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, 38161 + ... + 40726.

It is an arithmetic number, because the mean of its divisors is an integer number (25323048).

Almost surely, 2^101212021 is an apocalyptic number.

It is an amenable number.

101212021 is a deficient number, since it is larger than the sum of its proper divisors (80171).

101212021 is an equidigital number, since it uses as much as digits as its factorization.

101212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80170.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 101212021 is about 10060.4185300613. The cubic root of 101212021 is about 466.0265922676.

Adding to 101212021 its reverse (120212101), we get a palindrome (221424122).

The spelling of 101212021 in words is "one hundred one million, two hundred twelve thousand, twenty-one".