21320852747 has 2 divisors, whose sum is σ = 21320852748. Its totient is φ = 21320852746.

The previous prime is 21320852743. The next prime is 21320852863. The reversal of 21320852747 is 74725802312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21320852747 - 2² = 21320852743 is a prime.

It is not a weakly prime, because it can be changed into another prime (21320852743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660426373 + 10660426374.

It is an arithmetic number, because the mean of its divisors is an integer number (10660426374).

Almost surely, 2^21320852747 is an apocalyptic number.

21320852747 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320852747 is an equidigital number, since it uses as much as digits as its factorization.

21320852747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 188160, while the sum is 41.

The spelling of 21320852747 in words is "twenty-one billion, three hundred twenty million, eight hundred fifty-two thousand, seven hundred forty-seven".