21052443325 has 12 divisors (see below), whose sum is σ = 26947128448. Its totient is φ = 16298665200.

The previous prime is 21052443233. The next prime is 21052443341. The reversal of 21052443325 is 52334425012.

It is not a de Polignac number, because 21052443325 - 2¹³ = 21052435133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13581447 + ... + 13582996.

Almost surely, 2^21052443325 is an apocalyptic number.

21052443325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21052443325 is a deficient number, since it is larger than the sum of its proper divisors (5894685123).

21052443325 is a wasteful number, since it uses less digits than its factorization.

21052443325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27164484 (or 27164479 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 21052443325 its reverse (52334425012), we get a palindrome (73386868337).

The spelling of 21052443325 in words is "twenty-one billion, fifty-two million, four hundred forty-three thousand, three hundred twenty-five".