21302203031021 has 8 divisors (see below), whose sum is σ = 23240946454464. Its totient is φ = 19363822859520.

The previous prime is 21302203030981. The next prime is 21302203031059. The reversal of 21302203031021 is 12013030220312.

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 21302203031021 - 2³⁸ = 21027325124077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21302203030984 and 21302203031002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302203031071) 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, 90690356 + ... + 90924941.

It is an arithmetic number, because the mean of its divisors is an integer number (2905118306808).

Almost surely, 2^{21302203031021} is an apocalyptic number.

It is an amenable number.

21302203031021 is a deficient number, since it is larger than the sum of its proper divisors (1938743423443).

21302203031021 is a wasteful number, since it uses less digits than its factorization.

21302203031021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181625971.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21302203031021 its reverse (12013030220312), we get a palindrome (33315233251333).

The spelling of 21302203031021 in words is "twenty-one trillion, three hundred two billion, two hundred three million, thirty-one thousand, twenty-one".