10021001099981 has 4 divisors (see below), whose sum is σ = 10022265268512. Its totient is φ = 10019736931452.

The previous prime is 10021001099971. The next prime is 10021001100113. The reversal of 10021001099981 is 18999010012001.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10021001099981 is a prime.

It is a super-2 number, since 2×10021001099981² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021001099971) 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, 632072375 + ... + 632088228.

It is an arithmetic number, because the mean of its divisors is an integer number (2505566317128).

Almost surely, 2^{10021001099981} is an apocalyptic number.

It is an amenable number.

10021001099981 is a deficient number, since it is larger than the sum of its proper divisors (1264168531).

10021001099981 is an equidigital number, since it uses as much as digits as its factorization.

10021001099981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264168530.

The product of its (nonzero) digits is 11664, while the sum is 41.

The spelling of 10021001099981 in words is "ten trillion, twenty-one billion, one million, ninety-nine thousand, nine hundred eighty-one".