21021010002101 has 8 divisors (see below), whose sum is σ = 22129058455680. Its totient is φ = 19913129499168.

The previous prime is 21021010002079. The next prime is 21021010002211. The reversal of 21021010002101 is 10120001012012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21021010002101 - 2¹⁸ = 21021009739957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021010002901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41730701 + ... + 42231426.

It is an arithmetic number, because the mean of its divisors is an integer number (2766132306960).

Almost surely, 2^{21021010002101} is an apocalyptic number.

It is an amenable number.

21021010002101 is a deficient number, since it is larger than the sum of its proper divisors (1108048453579).

21021010002101 is a wasteful number, since it uses less digits than its factorization.

21021010002101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83975323.

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

Adding to 21021010002101 its reverse (10120001012012), we get a palindrome (31141011014113).

The spelling of 21021010002101 in words is "twenty-one trillion, twenty-one billion, ten million, two thousand, one hundred one".