101212121212021 has 4 divisors (see below), whose sum is σ = 101437537963500. Its totient is φ = 100986704460544.

The previous prime is 101212121211973. The next prime is 101212121212051. The reversal of 101212121212021 is 120212121212101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77073667863921 + 24138453348100 = 8779161^2 + 4913090^2 .

It is a cyclic number.

It is not a de Polignac number, because 101212121212021 - 2¹⁷ = 101212121080949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101212121212021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101212121212051) 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, 112708375066 + ... + 112708375963.

It is an arithmetic number, because the mean of its divisors is an integer number (25359384490875).

Almost surely, 2^{101212121212021} is an apocalyptic number.

It is an amenable number.

101212121212021 is a deficient number, since it is larger than the sum of its proper divisors (225416751479).

101212121212021 is an equidigital number, since it uses as much as digits as its factorization.

101212121212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225416751478.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 101212121212021 its reverse (120212121212101), we get a palindrome (221424242424122).

The spelling of 101212121212021 in words is "one hundred one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, twenty-one".