21252023320 has 32 divisors (see below), whose sum is σ = 52164058320. Its totient is φ = 7728008320.

The previous prime is 21252023267. The next prime is 21252023363. The reversal of 21252023320 is 2332025212.

It is a super-3 number, since 3×21252023320³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21252023291 and 21252023300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24149587 + ... + 24150466.

Almost surely, 2^21252023320 is an apocalyptic number.

21252023320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21252023320 is an abundant number, since it is smaller than the sum of its proper divisors (30912035000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21252023320 is a wasteful number, since it uses less digits than its factorization.

21252023320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48300075 (or 48300071 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

Adding to 21252023320 its reverse (2332025212), we get a palindrome (23584048532).

The spelling of 21252023320 in words is "twenty-one billion, two hundred fifty-two million, twenty-three thousand, three hundred twenty".