101021120021 has 4 divisors (see below), whose sum is σ = 101585484000. Its totient is φ = 100456756044.

The previous prime is 101021119999. The next prime is 101021120041. The reversal of 101021120021 is 120021120101.

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: 120021120101 = 12071 ⋅9942931.

It is a cyclic number.

It is not a de Polignac number, because 101021120021 - 2²⁶ = 100954011157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101021119984 and 101021120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101021120041) 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, 282181721 + ... + 282182078.

It is an arithmetic number, because the mean of its divisors is an integer number (25396371000).

Almost surely, 2^101021120021 is an apocalyptic number.

It is an amenable number.

101021120021 is a deficient number, since it is larger than the sum of its proper divisors (564363979).

101021120021 is an equidigital number, since it uses as much as digits as its factorization.

101021120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564363978.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 101021120021 its reverse (120021120101), we get a palindrome (221042240122).

The spelling of 101021120021 in words is "one hundred one billion, twenty-one million, one hundred twenty thousand, twenty-one".