21202012101 has 4 divisors (see below), whose sum is σ = 28269349472. Its totient is φ = 14134674732.

The previous prime is 21202012037. The next prime is 21202012121. The reversal of 21202012101 is 10121020212.

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 not a de Polignac number, because 21202012101 - 2⁶ = 21202012037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202012121) 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, 3533668681 + ... + 3533668686.

It is an arithmetic number, because the mean of its divisors is an integer number (7067337368).

Almost surely, 2^21202012101 is an apocalyptic number.

It is an amenable number.

21202012101 is a deficient number, since it is larger than the sum of its proper divisors (7067337371).

21202012101 is an equidigital number, since it uses as much as digits as its factorization.

21202012101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7067337370.

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

Adding to 21202012101 its reverse (10121020212), we get a palindrome (31323032313).

The spelling of 21202012101 in words is "twenty-one billion, two hundred two million, twelve thousand, one hundred one".