21436553066 has 8 divisors (see below), whose sum is σ = 32161459044. Its totient is φ = 10716066720.

The previous prime is 21436553057. The next prime is 21436553071. The reversal of 21436553066 is 66035563412.

It can be written as a sum of positive squares in 2 ways, for example, as 19732101841 + 1704451225 = 140471^2 + 41285^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1092755 + ... + 1112198.

Almost surely, 2^21436553066 is an apocalyptic number.

21436553066 is a deficient number, since it is larger than the sum of its proper divisors (10724905978).

21436553066 is a wasteful number, since it uses less digits than its factorization.

21436553066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2209816.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 21436553066 in words is "twenty-one billion, four hundred thirty-six million, five hundred fifty-three thousand, sixty-six".