21343746977 has 24 divisors (see below), whose sum is σ = 26743721472. Its totient is φ = 16934702400.

The previous prime is 21343746967. The next prime is 21343747049. The reversal of 21343746977 is 77964734312.

It is a happy number.

It is not a de Polignac number, because 21343746977 - 2²⁰ = 21342698401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21343746937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 270524 + ... + 340397.

It is an arithmetic number, because the mean of its divisors is an integer number (1114321728).

Almost surely, 2^21343746977 is an apocalyptic number.

It is an amenable number.

21343746977 is a deficient number, since it is larger than the sum of its proper divisors (5399974495).

21343746977 is a wasteful number, since it uses less digits than its factorization.

21343746977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610989 (or 610982 counting only the distinct ones).

The product of its digits is 5334336, while the sum is 53.

The spelling of 21343746977 in words is "twenty-one billion, three hundred forty-three million, seven hundred forty-six thousand, nine hundred seventy-seven".