21535002023 has 2 divisors, whose sum is σ = 21535002024. Its totient is φ = 21535002022.

The previous prime is 21535002019. The next prime is 21535002037. The reversal of 21535002023 is 32020053512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21535002023 - 2² = 21535002019 is a prime.

It is a super-2 number, since 2×21535002023² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21535002023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21535002053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10767501011 + 10767501012.

It is an arithmetic number, because the mean of its divisors is an integer number (10767501012).

Almost surely, 2^21535002023 is an apocalyptic number.

21535002023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21535002023 is an equidigital number, since it uses as much as digits as its factorization.

21535002023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 23.

Adding to 21535002023 its reverse (32020053512), we get a palindrome (53555055535).

The spelling of 21535002023 in words is "twenty-one billion, five hundred thirty-five million, two thousand, twenty-three".