25424421531 has 32 divisors (see below), whose sum is σ = 37013687040. Its totient is φ = 15469138944.

The previous prime is 25424421427. The next prime is 25424421571. The reversal of 25424421531 is 13512442452.

It is not a de Polignac number, because 25424421531 - 2¹¹ = 25424419483 is a prime.

It is a super-2 number, since 2×25424421531² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25424421492 and 25424421501.

It is not an unprimeable number, because it can be changed into a prime (25424421571) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107875 + ... + 249971.

It is an arithmetic number, because the mean of its divisors is an integer number (1156677720).

Almost surely, 2^25424421531 is an apocalyptic number.

25424421531 is a deficient number, since it is larger than the sum of its proper divisors (11589265509).

25424421531 is a wasteful number, since it uses less digits than its factorization.

25424421531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142235.

The product of its digits is 38400, while the sum is 33.

Adding to 25424421531 its reverse (13512442452), we get a palindrome (38936863983).

The spelling of 25424421531 in words is "twenty-five billion, four hundred twenty-four million, four hundred twenty-one thousand, five hundred thirty-one".