21011202101021 has 16 divisors (see below), whose sum is σ = 24128823935040. Its totient is φ = 18094926337920.

The previous prime is 21011202100997. The next prime is 21011202101051. The reversal of 21011202101021 is 12010120211012.

It is a cyclic number.

It is not a de Polignac number, because 21011202101021 - 2¹⁰ = 21011202099997 is a prime.

It is a super-2 number, since 2×21011202101021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21011202100987 and 21011202101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011202101051) 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 15 ways as a sum of consecutive naturals, for example, 2153321 + ... + 6830753.

It is an arithmetic number, because the mean of its divisors is an integer number (1508051495940).

Almost surely, 2^{21011202101021} is an apocalyptic number.

It is an amenable number.

21011202101021 is a deficient number, since it is larger than the sum of its proper divisors (3117621834019).

21011202101021 is a wasteful number, since it uses less digits than its factorization.

21011202101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4698956.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21011202101021 its reverse (12010120211012), we get a palindrome (33021322312033).

The spelling of 21011202101021 in words is "twenty-one trillion, eleven billion, two hundred two million, one hundred one thousand, twenty-one".