21320152747 has 2 divisors, whose sum is σ = 21320152748. Its totient is φ = 21320152746.

The previous prime is 21320152723. The next prime is 21320152759. The reversal of 21320152747 is 74725102312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21320152747 is a prime.

It is not a weakly prime, because it can be changed into another prime (21320852747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660076373 + 10660076374.

It is an arithmetic number, because the mean of its divisors is an integer number (10660076374).

Almost surely, 2^21320152747 is an apocalyptic number.

21320152747 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320152747 is an equidigital number, since it uses as much as digits as its factorization.

21320152747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 34.

The spelling of 21320152747 in words is "twenty-one billion, three hundred twenty million, one hundred fifty-two thousand, seven hundred forty-seven".