21352642061 has 2 divisors, whose sum is σ = 21352642062. Its totient is φ = 21352642060.

The previous prime is 21352642057. The next prime is 21352642097. The reversal of 21352642061 is 16024625312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20669812900 + 682829161 = 143770^2 + 26131^2 .

It is a cyclic number.

It is not a de Polignac number, because 21352642061 - 2² = 21352642057 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21352642361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676321030 + 10676321031.

It is an arithmetic number, because the mean of its divisors is an integer number (10676321031).

Almost surely, 2^21352642061 is an apocalyptic number.

It is an amenable number.

21352642061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21352642061 is an equidigital number, since it uses as much as digits as its factorization.

21352642061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 21352642061 in words is "twenty-one billion, three hundred fifty-two million, six hundred forty-two thousand, sixty-one".