11421121957 has 16 divisors (see below), whose sum is σ = 13358459520. Its totient is φ = 9562874112.

The previous prime is 11421121949. The next prime is 11421121963. The reversal of 11421121957 is 75912112411.

It is a cyclic number.

It is not a de Polignac number, because 11421121957 - 2³ = 11421121949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11421121967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58728 + ... + 162145.

It is an arithmetic number, because the mean of its divisors is an integer number (834903720).

Almost surely, 2^11421121957 is an apocalyptic number.

It is an amenable number.

11421121957 is a deficient number, since it is larger than the sum of its proper divisors (1937337563).

11421121957 is an equidigital number, since it uses as much as digits as its factorization.

11421121957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221052.

The product of its digits is 5040, while the sum is 34.

The spelling of 11421121957 in words is "eleven billion, four hundred twenty-one million, one hundred twenty-one thousand, nine hundred fifty-seven".