21277939199 has 4 divisors (see below), whose sum is σ = 23212297320. Its totient is φ = 19343581080.

The previous prime is 21277939157. The next prime is 21277939201. The reversal of 21277939199 is 99193977212.

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 21277939199 - 2¹⁶ = 21277873663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21277939399) 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, 967179044 + ... + 967179065.

It is an arithmetic number, because the mean of its divisors is an integer number (5803074330).

Almost surely, 2^21277939199 is an apocalyptic number.

21277939199 is a deficient number, since it is larger than the sum of its proper divisors (1934358121).

21277939199 is a wasteful number, since it uses less digits than its factorization.

21277939199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934358120.

The product of its digits is 3857868, while the sum is 59.

The spelling of 21277939199 in words is "twenty-one billion, two hundred seventy-seven million, nine hundred thirty-nine thousand, one hundred ninety-nine".