21201101002021 has 4 divisors (see below), whose sum is σ = 22316948423200. Its totient is φ = 20085253580844.

The previous prime is 21201101002013. The next prime is 21201101002027. The reversal of 21201101002021 is 12020010110212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21201101002021 - 2³ = 21201101002013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21201101001992 and 21201101002010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201101002027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557923710561 + ... + 557923710598.

It is an arithmetic number, because the mean of its divisors is an integer number (5579237105800).

Almost surely, 2^{21201101002021} is an apocalyptic number.

It is an amenable number.

21201101002021 is a deficient number, since it is larger than the sum of its proper divisors (1115847421179).

21201101002021 is a wasteful number, since it uses less digits than its factorization.

21201101002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115847421178.

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

Adding to 21201101002021 its reverse (12020010110212), we get a palindrome (33221111112233).

The spelling of 21201101002021 in words is "twenty-one trillion, two hundred one billion, one hundred one million, two thousand, twenty-one".