21079770433 has 4 divisors (see below), whose sum is σ = 21266317188. Its totient is φ = 20893223680.

The previous prime is 21079770409. The next prime is 21079770451. The reversal of 21079770433 is 33407797012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11484980224 + 9594790209 = 107168^2 + 97953^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21079770433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21079770433.

It is not an unprimeable number, because it can be changed into a prime (21079770403) 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, 93273208 + ... + 93273433.

It is an arithmetic number, because the mean of its divisors is an integer number (5316579297).

Almost surely, 2^21079770433 is an apocalyptic number.

It is an amenable number.

21079770433 is a deficient number, since it is larger than the sum of its proper divisors (186546755).

21079770433 is a wasteful number, since it uses less digits than its factorization.

21079770433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186546754.

The product of its (nonzero) digits is 222264, while the sum is 43.

The spelling of 21079770433 in words is "twenty-one billion, seventy-nine million, seven hundred seventy thousand, four hundred thirty-three".