21513051403325 has 12 divisors (see below), whose sum is σ = 27113498229588. Its totient is φ = 16928302742400.

The previous prime is 21513051403273. The next prime is 21513051403339. The reversal of 21513051403325 is 52330415031512.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 5098536904036 + 16414514499289 = 2257994^2 + 4051483^2 .

It is not a de Polignac number, because 21513051403325 - 2¹⁴ = 21513051386941 is a prime.

It is a super-2 number, since 2×21513051403325² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7053457952 + ... + 7053461001.

It is an arithmetic number, because the mean of its divisors is an integer number (2259458185799).

Almost surely, 2^{21513051403325} is an apocalyptic number.

21513051403325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21513051403325 is a deficient number, since it is larger than the sum of its proper divisors (5600446826263).

21513051403325 is a wasteful number, since it uses less digits than its factorization.

21513051403325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14106919024 (or 14106919019 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

Adding to 21513051403325 its reverse (52330415031512), we get a palindrome (73843466434837).

The spelling of 21513051403325 in words is "twenty-one trillion, five hundred thirteen billion, fifty-one million, four hundred three thousand, three hundred twenty-five".