21612903443 has 8 divisors (see below), whose sum is σ = 22238726256. Its totient is φ = 20995156000.

The previous prime is 21612903413. The next prime is 21612903451. The reversal of 21612903443 is 34430921612.

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 21612903443 - 2¹⁸ = 21612641299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21612903413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2013413 + ... + 2024118.

It is an arithmetic number, because the mean of its divisors is an integer number (2779840782).

Almost surely, 2^21612903443 is an apocalyptic number.

21612903443 is a deficient number, since it is larger than the sum of its proper divisors (625822813).

21612903443 is a wasteful number, since it uses less digits than its factorization.

21612903443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4037685.

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 21612903443 in words is "twenty-one billion, six hundred twelve million, nine hundred three thousand, four hundred forty-three".