21695043 has 8 divisors (see below), whose sum is σ = 30628368. Its totient is φ = 13612544.

The previous prime is 21695021. The next prime is 21695057. The reversal of 21695043 is 34059612.

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 21695043 - 2¹³ = 21686851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21695043.

It is not an unprimeable number, because it can be changed into a prime (21695083) 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, 212646 + ... + 212747.

It is an arithmetic number, because the mean of its divisors is an integer number (3828546).

Almost surely, 2^21695043 is an apocalyptic number.

21695043 is a deficient number, since it is larger than the sum of its proper divisors (8933325).

21695043 is a wasteful number, since it uses less digits than its factorization.

21695043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425413.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 21695043 is about 4657.7937910560. The cubic root of 21695043 is about 278.9032050755.

It can be divided in two parts, 216 and 95043, that added together give a palindrome (95259).

The spelling of 21695043 in words is "twenty-one million, six hundred ninety-five thousand, forty-three".