25121011005 has 32 divisors (see below), whose sum is σ = 44803249920. Its totient is φ = 13354770240.

The previous prime is 25121010997. The next prime is 25121011009. The reversal of 25121011005 is 50011012152.

It is not a de Polignac number, because 25121011005 - 2³ = 25121010997 is a prime.

It is a super-2 number, since 2×25121011005² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25121011009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 257182 + ... + 341151.

It is an arithmetic number, because the mean of its divisors is an integer number (1400101560).

Almost surely, 2^25121011005 is an apocalyptic number.

It is an amenable number.

25121011005 is a deficient number, since it is larger than the sum of its proper divisors (19682238915).

25121011005 is a wasteful number, since it uses less digits than its factorization.

25121011005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598658 (or 598652 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

Adding to 25121011005 its reverse (50011012152), we get a palindrome (75132023157).

The spelling of 25121011005 in words is "twenty-five billion, one hundred twenty-one million, eleven thousand, five".