21153266061 has 4 divisors (see below), whose sum is σ = 28204354752. Its totient is φ = 14102177372.

The previous prime is 21153266059. The next prime is 21153266111. The reversal of 21153266061 is 16066235112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21153266061 - 2¹ = 21153266059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153266011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3525544341 + ... + 3525544346.

It is an arithmetic number, because the mean of its divisors is an integer number (7051088688).

Almost surely, 2^21153266061 is an apocalyptic number.

It is an amenable number.

21153266061 is a deficient number, since it is larger than the sum of its proper divisors (7051088691).

21153266061 is an equidigital number, since it uses as much as digits as its factorization.

21153266061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7051088690.

The product of its (nonzero) digits is 12960, while the sum is 33.

The spelling of 21153266061 in words is "twenty-one billion, one hundred fifty-three million, two hundred sixty-six thousand, sixty-one".