21943051 has 8 divisors (see below), whose sum is σ = 23669744. Its totient is φ = 20221920.

The previous prime is 21943037. The next prime is 21943069. The reversal of 21943051 is 15034912.

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 21943051 - 2⁷ = 21942923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21943001) 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, 10861 + ... + 12721.

It is an arithmetic number, because the mean of its divisors is an integer number (2958718).

Almost surely, 2^21943051 is an apocalyptic number.

21943051 is a deficient number, since it is larger than the sum of its proper divisors (1726693).

21943051 is a wasteful number, since it uses less digits than its factorization.

21943051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 21943051 is about 4684.3410422385. The cubic root of 21943051 is about 279.9619463591.

Adding to 21943051 its reverse (15034912), we get a palindrome (36977963).

It can be divided in two parts, 21 and 943051, that multiplied together give a triangular number (19804071 = T₆₂₉₃).

The spelling of 21943051 in words is "twenty-one million, nine hundred forty-three thousand, fifty-one".