21167621305 has 8 divisors (see below), whose sum is σ = 25415596800. Its totient is φ = 16924462896.

The previous prime is 21167621261. The next prime is 21167621311. The reversal of 21167621305 is 50312676112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21167621305 - 2¹⁵ = 21167588537 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1194595 + ... + 1212184.

It is an arithmetic number, because the mean of its divisors is an integer number (3176949600).

Almost surely, 2^21167621305 is an apocalyptic number.

It is an amenable number.

21167621305 is a deficient number, since it is larger than the sum of its proper divisors (4247975495).

21167621305 is a wasteful number, since it uses less digits than its factorization.

21167621305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408543.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 21167621305 in words is "twenty-one billion, one hundred sixty-seven million, six hundred twenty-one thousand, three hundred five".