21528936007 has 2 divisors, whose sum is σ = 21528936008. Its totient is φ = 21528936006.

The previous prime is 21528935969. The next prime is 21528936029. The reversal of 21528936007 is 70063982512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21528936007 - 2¹⁵ = 21528903239 is a prime.

It is a super-2 number, since 2×21528936007² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21528936097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10764468003 + 10764468004.

It is an arithmetic number, because the mean of its divisors is an integer number (10764468004).

Almost surely, 2^21528936007 is an apocalyptic number.

21528936007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21528936007 is an equidigital number, since it uses as much as digits as its factorization.

21528936007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 21528936007 in words is "twenty-one billion, five hundred twenty-eight million, nine hundred thirty-six thousand, seven".