21469641 has 8 divisors (see below), whose sum is σ = 28648320. Its totient is φ = 14302032.

The previous prime is 21469631. The next prime is 21469699. The reversal of 21469641 is 14696412.

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

It is not a de Polignac number, because 21469641 - 2¹⁵ = 21436873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21469631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4455 + ... + 7923.

It is an arithmetic number, because the mean of its divisors is an integer number (3581040).

Almost surely, 2^21469641 is an apocalyptic number.

It is an amenable number.

21469641 is a deficient number, since it is larger than the sum of its proper divisors (7178679).

21469641 is a wasteful number, since it uses less digits than its factorization.

21469641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5535.

The product of its digits is 10368, while the sum is 33.

The square root of 21469641 is about 4633.5343961171. The cubic root of 21469641 is about 277.9339464895.

The spelling of 21469641 in words is "twenty-one million, four hundred sixty-nine thousand, six hundred forty-one".