21001202101021 has 8 divisors (see below), whose sum is σ = 21678876059904. Its totient is φ = 20323541631360.

The previous prime is 21001202100947. The next prime is 21001202101027. The reversal of 21001202101021 is 12010120210012.

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 21001202101021 - 2²¹ = 21001200003869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001202100992 and 21001202101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001202101027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159700 + ... + 6482893.

It is an arithmetic number, because the mean of its divisors is an integer number (2709859507488).

Almost surely, 2^{21001202101021} is an apocalyptic number.

It is an amenable number.

21001202101021 is a deficient number, since it is larger than the sum of its proper divisors (677673958883).

21001202101021 is a wasteful number, since it uses less digits than its factorization.

21001202101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6744611.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21001202101021 its reverse (12010120210012), we get a palindrome (33011322311033).

The spelling of 21001202101021 in words is "twenty-one trillion, one billion, two hundred two million, one hundred one thousand, twenty-one".