21503320152 has 16 divisors (see below), whose sum is σ = 53758300440. Its totient is φ = 7167773376.

The previous prime is 21503320147. The next prime is 21503320177. The reversal of 21503320152 is 25102330512.

It is a happy number.

It is a super-3 number, since 3×21503320152³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 895971673 = 21503320152 / (2 + 1 + 5 + 0 + 3 + 3 + 2 + 0 + 1 + 5 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447985813 + ... + 447985860.

Almost surely, 2^21503320152 is an apocalyptic number.

It is an amenable number.

21503320152 is an abundant number, since it is smaller than the sum of its proper divisors (32254980288).

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

21503320152 is a wasteful number, since it uses less digits than its factorization.

21503320152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895971682 (or 895971678 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 21503320152 its reverse (25102330512), we get a palindrome (46605650664).

The spelling of 21503320152 in words is "twenty-one billion, five hundred three million, three hundred twenty thousand, one hundred fifty-two".