21020002231321 has 8 divisors (see below), whose sum is σ = 21748833892800. Its totient is φ = 20291437503120.

The previous prime is 21020002231303. The next prime is 21020002231331. The reversal of 21020002231321 is 12313220002012.

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 21020002231321 - 2²⁹ = 21019465360409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020002231301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66573091 + ... + 66888088.

It is an arithmetic number, because the mean of its divisors is an integer number (2718604236600).

Almost surely, 2^{21020002231321} is an apocalyptic number.

It is an amenable number.

21020002231321 is a deficient number, since it is larger than the sum of its proper divisors (728831661479).

21020002231321 is a wasteful number, since it uses less digits than its factorization.

21020002231321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133466639.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21020002231321 its reverse (12313220002012), we get a palindrome (33333222233333).

The spelling of 21020002231321 in words is "twenty-one trillion, twenty billion, two million, two hundred thirty-one thousand, three hundred twenty-one".