101023870021 has 4 divisors (see below), whose sum is σ = 103173314112. Its totient is φ = 98874425932.

The previous prime is 101023870001. The next prime is 101023870043. The reversal of 101023870021 is 120078320101.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120078320101 = 233 ⋅515357597.

It is a cyclic number.

It is not a de Polignac number, because 101023870021 - 2³¹ = 98876386373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101023870001) 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, 1074721975 + ... + 1074722068.

It is an arithmetic number, because the mean of its divisors is an integer number (25793328528).

Almost surely, 2^101023870021 is an apocalyptic number.

It is an amenable number.

101023870021 is a deficient number, since it is larger than the sum of its proper divisors (2149444091).

101023870021 is an equidigital number, since it uses as much as digits as its factorization.

101023870021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149444090.

The product of its (nonzero) digits is 672, while the sum is 25.

The spelling of 101023870021 in words is "one hundred one billion, twenty-three million, eight hundred seventy thousand, twenty-one".