21062451525 has 24 divisors (see below), whose sum is σ = 35097467904. Its totient is φ = 11144851200.

The previous prime is 21062451523. The next prime is 21062451547. The reversal of 21062451525 is 52515426012.

It is not a de Polignac number, because 21062451525 - 2¹ = 21062451523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21062451523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1096116 + ... + 1115165.

It is an arithmetic number, because the mean of its divisors is an integer number (1462394496).

Almost surely, 2^21062451525 is an apocalyptic number.

21062451525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21062451525 is a deficient number, since it is larger than the sum of its proper divisors (14035016379).

21062451525 is a wasteful number, since it uses less digits than its factorization.

21062451525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211421 (or 2211416 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

Adding to 21062451525 its reverse (52515426012), we get a palindrome (73577877537).

The spelling of 21062451525 in words is "twenty-one billion, sixty-two million, four hundred fifty-one thousand, five hundred twenty-five".