21401943 has 8 divisors (see below), whose sum is σ = 28566528. Its totient is φ = 14252664.

The previous prime is 21401927. The next prime is 21401951. The reversal of 21401943 is 34910412.

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

It is not a de Polignac number, because 21401943 - 2⁴ = 21401927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401903) 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, 21 + ... + 6542.

It is an arithmetic number, because the mean of its divisors is an integer number (3570816).

Almost surely, 2^21401943 is an apocalyptic number.

21401943 is a deficient number, since it is larger than the sum of its proper divisors (7164585).

21401943 is a wasteful number, since it uses less digits than its factorization.

21401943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7653.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21401943 is about 4626.2234057598. The cubic root of 21401943 is about 277.6415121101.

The spelling of 21401943 in words is "twenty-one million, four hundred one thousand, nine hundred forty-three".