21277213819 has 16 divisors (see below), whose sum is σ = 22704924672. Its totient is φ = 19892543968.

The previous prime is 21277213817. The next prime is 21277213823. The reversal of 21277213819 is 91831277212.

It is not a de Polignac number, because 21277213819 - 2¹ = 21277213817 is a prime.

It is a super-2 number, since 2×21277213819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21277213813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 822882 + ... + 848344.

It is an arithmetic number, because the mean of its divisors is an integer number (1419057792).

Almost surely, 2^21277213819 is an apocalyptic number.

21277213819 is a deficient number, since it is larger than the sum of its proper divisors (1427710853).

21277213819 is a wasteful number, since it uses less digits than its factorization.

21277213819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26306.

The product of its digits is 84672, while the sum is 43.

The spelling of 21277213819 in words is "twenty-one billion, two hundred seventy-seven million, two hundred thirteen thousand, eight hundred nineteen".