21023530145 has 8 divisors (see below), whose sum is σ = 25244182656. Its totient is φ = 16808193136.

The previous prime is 21023530133. The next prime is 21023530147. The reversal of 21023530145 is 54103532012.

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 21023530145 - 2¹⁴ = 21023513761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21023530147) 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, 1320167 + ... + 1335996.

It is an arithmetic number, because the mean of its divisors is an integer number (3155522832).

Almost surely, 2^21023530145 is an apocalyptic number.

It is an amenable number.

21023530145 is a deficient number, since it is larger than the sum of its proper divisors (4220652511).

21023530145 is a wasteful number, since it uses less digits than its factorization.

21023530145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2657751.

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 21023530145 in words is "twenty-one billion, twenty-three million, five hundred thirty thousand, one hundred forty-five".