21202001101021 has 64 divisors (see below), whose sum is σ = 24678283069440. Its totient is φ = 18061928881920.

The previous prime is 21202001101003. The next prime is 21202001101027. The reversal of 21202001101021 is 12010110020212.

It is a cyclic number.

It is not a de Polignac number, because 21202001101021 - 2¹⁷ = 21202000969949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21202001100992 and 21202001101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202001101027) 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 63 ways as a sum of consecutive naturals, for example, 463844850 + ... + 463890556.

It is an arithmetic number, because the mean of its divisors is an integer number (385598172960).

Almost surely, 2^{21202001101021} is an apocalyptic number.

It is an amenable number.

21202001101021 is a deficient number, since it is larger than the sum of its proper divisors (3476281968419).

21202001101021 is a wasteful number, since it uses less digits than its factorization.

21202001101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46226.

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

Adding to 21202001101021 its reverse (12010110020212), we get a palindrome (33212111121233).

The spelling of 21202001101021 in words is "twenty-one trillion, two hundred two billion, one million, one hundred one thousand, twenty-one".