101021010021 has 12 divisors (see below), whose sum is σ = 152263551648. Its totient is φ = 64419194664.

The previous prime is 101021010019. The next prime is 101021010037. The reversal of 101021010021 is 120010120101.

It is a happy number.

It is not a de Polignac number, because 101021010021 - 2¹ = 101021010019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 101021009985 and 101021010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101021010721) 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, 244011895 + ... + 244012308.

It is an arithmetic number, because the mean of its divisors is an integer number (12688629304).

Almost surely, 2^101021010021 is an apocalyptic number.

It is an amenable number.

101021010021 is a deficient number, since it is larger than the sum of its proper divisors (51242541627).

101021010021 is a wasteful number, since it uses less digits than its factorization.

101021010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488024232 (or 488024229 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 101021010021 its reverse (120010120101), we get a palindrome (221031130122).

The spelling of 101021010021 in words is "one hundred one billion, twenty-one million, ten thousand, twenty-one".