21525032201 has 2 divisors, whose sum is σ = 21525032202. Its totient is φ = 21525032200.

The previous prime is 21525032167. The next prime is 21525032203. The reversal of 21525032201 is 10223052512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19055041600 + 2469990601 = 138040^2 + 49699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21525032201 is a prime.

It is a super-2 number, since 2×21525032201² (a number of 21 digits) contains 22 as substring.

Together with 21525032203, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21525032203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10762516100 + 10762516101.

It is an arithmetic number, because the mean of its divisors is an integer number (10762516101).

Almost surely, 2^21525032201 is an apocalyptic number.

It is an amenable number.

21525032201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21525032201 is an equidigital number, since it uses as much as digits as its factorization.

21525032201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 21525032201 its reverse (10223052512), we get a palindrome (31748084713).

The spelling of 21525032201 in words is "twenty-one billion, five hundred twenty-five million, thirty-two thousand, two hundred one".