101012400021 has 12 divisors (see below), whose sum is σ = 145840388928. Its totient is φ = 62161476624.

The previous prime is 101012400019. The next prime is 101012400059. The reversal of 101012400021 is 120004210101.

It is a happy number.

It is not a de Polignac number, because 101012400021 - 2¹ = 101012400019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101012400721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99617245 + ... + 99618258.

It is an arithmetic number, because the mean of its divisors is an integer number (12153365744).

Almost surely, 2^101012400021 is an apocalyptic number.

It is an amenable number.

101012400021 is a deficient number, since it is larger than the sum of its proper divisors (44827988907).

101012400021 is a wasteful number, since it uses less digits than its factorization.

101012400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199235532 (or 199235519 counting only the distinct ones).

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

Adding to 101012400021 its reverse (120004210101), we get a palindrome (221016610122).

The spelling of 101012400021 in words is "one hundred one billion, twelve million, four hundred thousand, twenty-one".