11542717421 has 4 divisors (see below), whose sum is σ = 11561988000. Its totient is φ = 11523446844.

The previous prime is 11542717411. The next prime is 11542717447. The reversal of 11542717421 is 12471724511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11542717421 is a prime.

It is a super-2 number, since 2×11542717421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11542717411) 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, 9634391 + ... + 9635588.

It is an arithmetic number, because the mean of its divisors is an integer number (2890497000).

Almost surely, 2^11542717421 is an apocalyptic number.

It is an amenable number.

11542717421 is a deficient number, since it is larger than the sum of its proper divisors (19270579).

11542717421 is an equidigital number, since it uses as much as digits as its factorization.

11542717421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19270578.

The product of its digits is 15680, while the sum is 35.

The spelling of 11542717421 in words is "eleven billion, five hundred forty-two million, seven hundred seventeen thousand, four hundred twenty-one".