21573414061 has 2 divisors, whose sum is σ = 21573414062. Its totient is φ = 21573414060.

The previous prime is 21573414053. The next prime is 21573414067. The reversal of 21573414061 is 16041437512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21230238436 + 343175625 = 145706^2 + 18525^2 .

It is a cyclic number.

It is not a de Polignac number, because 21573414061 - 2³ = 21573414053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21573414067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10786707030 + 10786707031.

It is an arithmetic number, because the mean of its divisors is an integer number (10786707031).

Almost surely, 2^21573414061 is an apocalyptic number.

It is an amenable number.

21573414061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21573414061 is an equidigital number, since it uses as much as digits as its factorization.

21573414061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 21573414061 in words is "twenty-one billion, five hundred seventy-three million, four hundred fourteen thousand, sixty-one".