101421440021 has 12 divisors (see below), whose sum is σ = 115661232960. Its totient is φ = 88192551480.

The previous prime is 101421440009. The next prime is 101421440023. The reversal of 101421440021 is 120044124101.

It is not a de Polignac number, because 101421440021 - 2¹⁸ = 101421177877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101421439975 and 101421440002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101421440023) 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, 8708861 + ... + 8720498.

It is an arithmetic number, because the mean of its divisors is an integer number (9638436080).

Almost surely, 2^101421440021 is an apocalyptic number.

101421440021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

101421440021 is a deficient number, since it is larger than the sum of its proper divisors (14239792939).

101421440021 is a wasteful number, since it uses less digits than its factorization.

101421440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17429416 (or 17429393 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 101421440021 its reverse (120044124101), we get a palindrome (221465564122).

The spelling of 101421440021 in words is "one hundred one billion, four hundred twenty-one million, four hundred forty thousand, twenty-one".