21021002002101 has 8 divisors (see below), whose sum is σ = 29246611481280. Its totient is φ = 13404696928832.

The previous prime is 21021002002097. The next prime is 21021002002103. The reversal of 21021002002101 is 10120020012012.

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 21021002002101 - 2² = 21021002002097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021002002103) 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, 152326101396 + ... + 152326101533.

It is an arithmetic number, because the mean of its divisors is an integer number (3655826435160).

Almost surely, 2^{21021002002101} is an apocalyptic number.

It is an amenable number.

21021002002101 is a deficient number, since it is larger than the sum of its proper divisors (8225609479179).

21021002002101 is a wasteful number, since it uses less digits than its factorization.

21021002002101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304652202955.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21021002002101 its reverse (10120020012012), we get a palindrome (31141022014113).

The spelling of 21021002002101 in words is "twenty-one trillion, twenty-one billion, two million, two thousand, one hundred one".