21336737074 has 4 divisors (see below), whose sum is σ = 32005105614. Its totient is φ = 10668368536.

The previous prime is 21336737039. The next prime is 21336737089. The reversal of 21336737074 is 47073763312.

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

It can be written as a sum of positive squares in only one way, i.e., 15262872849 + 6073864225 = 123543^2 + 77935^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21336737074.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5334184267 + ... + 5334184270.

Almost surely, 2^21336737074 is an apocalyptic number.

21336737074 is a deficient number, since it is larger than the sum of its proper divisors (10668368540).

21336737074 is a wasteful number, since it uses less digits than its factorization.

21336737074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10668368539.

The product of its (nonzero) digits is 444528, while the sum is 43.

The spelling of 21336737074 in words is "twenty-one billion, three hundred thirty-six million, seven hundred thirty-seven thousand, seventy-four".