21303002021 has 8 divisors (see below), whose sum is σ = 24370329984. Its totient is φ = 18241684560.

The previous prime is 21303001957. The next prime is 21303002041. The reversal of 21303002021 is 12020030312.

It is a happy number.

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 21303002021 - 2⁶ = 21303001957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21303001987 and 21303002005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303002041) 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, 1495025 + ... + 1509206.

It is an arithmetic number, because the mean of its divisors is an integer number (3046291248).

Almost surely, 2^21303002021 is an apocalyptic number.

It is an amenable number.

21303002021 is a deficient number, since it is larger than the sum of its proper divisors (3067327963).

21303002021 is a wasteful number, since it uses less digits than its factorization.

21303002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3005251.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21303002021 its reverse (12020030312), we get a palindrome (33323032333).

The spelling of 21303002021 in words is "twenty-one billion, three hundred three million, two thousand, twenty-one".