11654127421 has 4 divisors (see below), whose sum is σ = 11655992700. Its totient is φ = 11652262144.

The previous prime is 11654127361. The next prime is 11654127449. The reversal of 11654127421 is 12472145611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12472145611 = 109849 ⋅113539.

It can be written as a sum of positive squares in 2 ways, for example, as 8392575321 + 3261552100 = 91611^2 + 57110^2 .

It is a cyclic number.

It is not a de Polignac number, because 11654127421 - 2¹⁹ = 11653603133 is a prime.

It is a super-2 number, since 2×11654127421² (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 (11654127481) 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, 923236 + ... + 935773.

It is an arithmetic number, because the mean of its divisors is an integer number (2913998175).

Almost surely, 2^11654127421 is an apocalyptic number.

It is an amenable number.

11654127421 is a deficient number, since it is larger than the sum of its proper divisors (1865279).

11654127421 is an equidigital number, since it uses as much as digits as its factorization.

11654127421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865278.

The product of its digits is 13440, while the sum is 34.

The spelling of 11654127421 in words is "eleven billion, six hundred fifty-four million, one hundred twenty-seven thousand, four hundred twenty-one".