21528926747 has 2 divisors, whose sum is σ = 21528926748. Its totient is φ = 21528926746.

The previous prime is 21528926729. The next prime is 21528926759. The reversal of 21528926747 is 74762982512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21528926747 - 2⁸ = 21528926491 is a prime.

It is not a weakly prime, because it can be changed into another prime (21528926767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10764463373 + 10764463374.

It is an arithmetic number, because the mean of its divisors is an integer number (10764463374).

Almost surely, 2^21528926747 is an apocalyptic number.

21528926747 is a deficient number, since it is larger than the sum of its proper divisors (1).

21528926747 is an equidigital number, since it uses as much as digits as its factorization.

21528926747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 53.

The spelling of 21528926747 in words is "twenty-one billion, five hundred twenty-eight million, nine hundred twenty-six thousand, seven hundred forty-seven".