11621531321551 has 8 divisors (see below), whose sum is σ = 12637722455280. Its totient is φ = 10642292592768.

The previous prime is 11621531321479. The next prime is 11621531321597. The reversal of 11621531321551 is 15512313512611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11621531321551 - 2¹⁹ = 11621530797263 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

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 11621531321551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11621531321251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9238100581 + ... + 9238101838.

It is an arithmetic number, because the mean of its divisors is an integer number (1579715306910).

Almost surely, 2^{11621531321551} is an apocalyptic number.

11621531321551 is a deficient number, since it is larger than the sum of its proper divisors (1016191133729).

11621531321551 is a wasteful number, since it uses less digits than its factorization.

11621531321551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18476202473.

The product of its digits is 27000, while the sum is 37.

The spelling of 11621531321551 in words is "eleven trillion, six hundred twenty-one billion, five hundred thirty-one million, three hundred twenty-one thousand, five hundred fifty-one".