21201588061 has 2 divisors, whose sum is σ = 21201588062. Its totient is φ = 21201588060.

The previous prime is 21201588043. The next prime is 21201588119. The reversal of 21201588061 is 16088510212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14249196900 + 6952391161 = 119370^2 + 83381^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201588061 - 2²³ = 21193199453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201585061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600794030 + 10600794031.

It is an arithmetic number, because the mean of its divisors is an integer number (10600794031).

Almost surely, 2^21201588061 is an apocalyptic number.

It is an amenable number.

21201588061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201588061 is an equidigital number, since it uses as much as digits as its factorization.

21201588061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 34.

The spelling of 21201588061 in words is "twenty-one billion, two hundred one million, five hundred eighty-eight thousand, sixty-one".