21365035043 has 4 divisors (see below), whose sum is σ = 23307310968. Its totient is φ = 19422759120.

The previous prime is 21365035001. The next prime is 21365035099. The reversal of 21365035043 is 34053056312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21365035043 - 2⁸ = 21365034787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21365034043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 971137946 + ... + 971137967.

It is an arithmetic number, because the mean of its divisors is an integer number (5826827742).

Almost surely, 2^21365035043 is an apocalyptic number.

21365035043 is a deficient number, since it is larger than the sum of its proper divisors (1942275925).

21365035043 is a wasteful number, since it uses less digits than its factorization.

21365035043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1942275924.

The product of its (nonzero) digits is 32400, while the sum is 32.

The spelling of 21365035043 in words is "twenty-one billion, three hundred sixty-five million, thirty-five thousand, forty-three".