101202120021 has 16 divisors (see below), whose sum is σ = 138610137600. Its totient is φ = 65631803328.

The previous prime is 101202120017. The next prime is 101202120037. The reversal of 101202120021 is 120021202101.

It is not a de Polignac number, because 101202120021 - 2² = 101202120017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 101202119979 and 101202120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101202120121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499615 + ... + 672323.

It is an arithmetic number, because the mean of its divisors is an integer number (8663133600).

Almost surely, 2^101202120021 is an apocalyptic number.

It is an amenable number.

101202120021 is a deficient number, since it is larger than the sum of its proper divisors (37408017579).

101202120021 is a wasteful number, since it uses less digits than its factorization.

101202120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178028.

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

Adding to 101202120021 its reverse (120021202101), we get a palindrome (221223322122).

The spelling of 101202120021 in words is "one hundred one billion, two hundred two million, one hundred twenty thousand, twenty-one".