21343746937 has 2 divisors, whose sum is σ = 21343746938. Its totient is φ = 21343746936.

The previous prime is 21343746899. The next prime is 21343746967. The reversal of 21343746937 is 73964734312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17026074256 + 4317672681 = 130484^2 + 65709^2 .

It is a cyclic number.

It is not a de Polignac number, because 21343746937 - 2¹¹ = 21343744889 is a prime.

It is not a weakly prime, because it can be changed into another prime (21343746967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671873468 + 10671873469.

It is an arithmetic number, because the mean of its divisors is an integer number (10671873469).

Almost surely, 2^21343746937 is an apocalyptic number.

It is an amenable number.

21343746937 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343746937 is an equidigital number, since it uses as much as digits as its factorization.

21343746937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 49.

The spelling of 21343746937 in words is "twenty-one billion, three hundred forty-three million, seven hundred forty-six thousand, nine hundred thirty-seven".