25121042011 has 12 divisors (see below), whose sum is σ = 27507732840. Its totient is φ = 22928093760.

The previous prime is 25121041993. The next prime is 25121042017. The reversal of 25121042011 is 11024012152.

It is not a de Polignac number, because 25121042011 - 2¹⁷ = 25120910939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25121042011.

It is not an unprimeable number, because it can be changed into a prime (25121042017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 820045 + ... + 850126.

It is an arithmetic number, because the mean of its divisors is an integer number (2292311070).

Almost surely, 2^25121042011 is an apocalyptic number.

25121042011 is a deficient number, since it is larger than the sum of its proper divisors (2386690829).

25121042011 is a wasteful number, since it uses less digits than its factorization.

25121042011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670286 (or 1670273 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 25121042011 its reverse (11024012152), we get a palindrome (36145054163).

The spelling of 25121042011 in words is "twenty-five billion, one hundred twenty-one million, forty-two thousand, eleven".