21002010222021 has 4 divisors (see below), whose sum is σ = 28002680296032. Its totient is φ = 14001340148012.

The previous prime is 21002010221989. The next prime is 21002010222023. The reversal of 21002010222021 is 12022201020012.

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 21002010222021 - 2⁵ = 21002010221989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002010222023) 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, 3500335037001 + ... + 3500335037006.

It is an arithmetic number, because the mean of its divisors is an integer number (7000670074008).

Almost surely, 2^{21002010222021} is an apocalyptic number.

It is an amenable number.

21002010222021 is a deficient number, since it is larger than the sum of its proper divisors (7000670074011).

21002010222021 is an equidigital number, since it uses as much as digits as its factorization.

21002010222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000670074010.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21002010222021 its reverse (12022201020012), we get a palindrome (33024211242033).

The spelling of 21002010222021 in words is "twenty-one trillion, two billion, ten million, two hundred twenty-two thousand, twenty-one".