11653372421 has 4 divisors (see below), whose sum is σ = 11657680032. Its totient is φ = 11649064812.

The previous prime is 11653372417. The next prime is 11653372439. The reversal of 11653372421 is 12427335611.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12427335611 = 6053 ⋅2053087.

It is a cyclic number.

It is not a de Polignac number, because 11653372421 - 2² = 11653372417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11653372121) 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, 2149745 + ... + 2155158.

It is an arithmetic number, because the mean of its divisors is an integer number (2914420008).

Almost surely, 2^11653372421 is an apocalyptic number.

It is an amenable number.

11653372421 is a deficient number, since it is larger than the sum of its proper divisors (4307611).

11653372421 is an equidigital number, since it uses as much as digits as its factorization.

11653372421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4307610.

The product of its digits is 30240, while the sum is 35.

The spelling of 11653372421 in words is "eleven billion, six hundred fifty-three million, three hundred seventy-two thousand, four hundred twenty-one".