11251124215 has 4 divisors (see below), whose sum is σ = 13501349064. Its totient is φ = 9000899368.

The previous prime is 11251124201. The next prime is 11251124219. The reversal of 11251124215 is 51242115211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11251124215 - 2²³ = 11242735607 is a prime.

It is a super-2 number, since 2×11251124215² (a number of 21 digits) contains 22 as substring.

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 11251124215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11251124219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1125112417 + ... + 1125112426.

It is an arithmetic number, because the mean of its divisors is an integer number (3375337266).

Almost surely, 2^11251124215 is an apocalyptic number.

11251124215 is a deficient number, since it is larger than the sum of its proper divisors (2250224849).

11251124215 is an equidigital number, since it uses as much as digits as its factorization.

11251124215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250224848.

The product of its digits is 800, while the sum is 25.

Adding to 11251124215 its reverse (51242115211), we get a palindrome (62493239426).

The spelling of 11251124215 in words is "eleven billion, two hundred fifty-one million, one hundred twenty-four thousand, two hundred fifteen".