21277465802 has 4 divisors (see below), whose sum is σ = 31916198706. Its totient is φ = 10638732900.

The previous prime is 21277465801. The next prime is 21277465819. The reversal of 21277465802 is 20856477212.

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., 19855346281 + 1422119521 = 140909^2 + 37711^2 .

It is not an unprimeable number, because it can be changed into a prime (21277465801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5319366449 + ... + 5319366452.

Almost surely, 2^21277465802 is an apocalyptic number.

21277465802 is a deficient number, since it is larger than the sum of its proper divisors (10638732904).

21277465802 is a wasteful number, since it uses less digits than its factorization.

21277465802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10638732903.

The product of its (nonzero) digits is 376320, while the sum is 44.

The spelling of 21277465802 in words is "twenty-one billion, two hundred seventy-seven million, four hundred sixty-five thousand, eight hundred two".