1305423021525 has 48 divisors (see below), whose sum is σ = 2573872594944. Its totient is φ = 570818508480.

The previous prime is 1305423021499. The next prime is 1305423021541. The reversal of 1305423021525 is 5251203245031.

It is not a de Polignac number, because 1305423021525 - 2⁵ = 1305423021493 is a prime.

It is a super-2 number, since 2×1305423021525² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54042709 + ... + 54066858.

It is an arithmetic number, because the mean of its divisors is an integer number (53622345728).

Almost surely, 2^{1305423021525} is an apocalyptic number.

1305423021525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1305423021525 is a deficient number, since it is larger than the sum of its proper divisors (1268449573419).

1305423021525 is a wasteful number, since it uses less digits than its factorization.

1305423021525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108109610 (or 108109605 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 1305423021525 its reverse (5251203245031), we get a palindrome (6556626266556).

The spelling of 1305423021525 in words is "one trillion, three hundred five billion, four hundred twenty-three million, twenty-one thousand, five hundred twenty-five".