21021020002101 has 16 divisors (see below), whose sum is σ = 32033573147264. Its totient is φ = 12011432929344.

The previous prime is 21021020002043. The next prime is 21021020002109. The reversal of 21021020002101 is 10120002012012.

It is not a de Polignac number, because 21021020002101 - 2¹⁷ = 21021019871029 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 (21021020002109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23657566 + ... + 24530031.

It is an arithmetic number, because the mean of its divisors is an integer number (2002098321704).

Almost surely, 2^{21021020002101} is an apocalyptic number.

21021020002101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21021020002101 is a deficient number, since it is larger than the sum of its proper divisors (11012553145163).

21021020002101 is a wasteful number, since it uses less digits than its factorization.

21021020002101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48208380.

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

Adding to 21021020002101 its reverse (10120002012012), we get a palindrome (31141022014113).

The spelling of 21021020002101 in words is "twenty-one trillion, twenty-one billion, twenty million, two thousand, one hundred one".