10101212021 has 4 divisors (see below), whose sum is σ = 10101694944. Its totient is φ = 10100729100.

The previous prime is 10101211951. The next prime is 10101212027. The reversal of 10101212021 is 12021210101.

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: 12021210101 = 31 ⋅387780971.

It is a cyclic number.

It is not a de Polignac number, because 10101212021 - 2¹⁰ = 10101210997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10101211993 and 10101212011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10101212027) 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, 208595 + ... + 252416.

It is an arithmetic number, because the mean of its divisors is an integer number (2525423736).

Almost surely, 2^10101212021 is an apocalyptic number.

It is an amenable number.

10101212021 is a deficient number, since it is larger than the sum of its proper divisors (482923).

10101212021 is an equidigital number, since it uses as much as digits as its factorization.

10101212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482922.

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

Adding to 10101212021 its reverse (12021210101), we get a palindrome (22122422122).

The spelling of 10101212021 in words is "ten billion, one hundred one million, two hundred twelve thousand, twenty-one".