21203013023 has 8 divisors (see below), whose sum is σ = 21279442800. Its totient is φ = 21126631680.

The previous prime is 21203013017. The next prime is 21203013067. The reversal of 21203013023 is 32031030212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203013023 is a prime.

It is a super-2 number, since 2×21203013023² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21203012992 and 21203013010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203013823) 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, 1021553 + ... + 1042101.

It is an arithmetic number, because the mean of its divisors is an integer number (2659930350).

Almost surely, 2^21203013023 is an apocalyptic number.

21203013023 is a deficient number, since it is larger than the sum of its proper divisors (76429777).

21203013023 is a wasteful number, since it uses less digits than its factorization.

21203013023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24217.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21203013023 its reverse (32031030212), we get a palindrome (53234043235).

The spelling of 21203013023 in words is "twenty-one billion, two hundred three million, thirteen thousand, twenty-three".