11621732021 has 4 divisors (see below), whose sum is σ = 11633005344. Its totient is φ = 11610458700.

The previous prime is 11621731999. The next prime is 11621732041. The reversal of 11621732021 is 12023712611.

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: 12023712611 = 283 ⋅42486617.

It is a cyclic number.

It is not a de Polignac number, because 11621732021 - 2¹⁰ = 11621730997 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 (11621732041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5635115 + ... + 5637176.

It is an arithmetic number, because the mean of its divisors is an integer number (2908251336).

Almost surely, 2^11621732021 is an apocalyptic number.

It is an amenable number.

11621732021 is a deficient number, since it is larger than the sum of its proper divisors (11273323).

11621732021 is a wasteful number, since it uses less digits than its factorization.

11621732021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11273322.

The product of its (nonzero) digits is 1008, while the sum is 26.

The spelling of 11621732021 in words is "eleven billion, six hundred twenty-one million, seven hundred thirty-two thousand, twenty-one".