21151036205 has 8 divisors (see below), whose sum is σ = 27333646872. Its totient is φ = 15619226688.

The previous prime is 21151036177. The next prime is 21151036237. The reversal of 21151036205 is 50263015112.

It can be written as a sum of positive squares in 4 ways, for example, as 26739241 + 21124296964 = 5171^2 + 145342^2 .

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

It is not a de Polignac number, because 21151036205 - 2¹⁶ = 21150970669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 162700214 + ... + 162700343.

It is an arithmetic number, because the mean of its divisors is an integer number (3416705859).

Almost surely, 2^21151036205 is an apocalyptic number.

It is an amenable number.

21151036205 is a deficient number, since it is larger than the sum of its proper divisors (6182610667).

21151036205 is a wasteful number, since it uses less digits than its factorization.

21151036205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325400575.

The product of its (nonzero) digits is 1800, while the sum is 26.

The spelling of 21151036205 in words is "twenty-one billion, one hundred fifty-one million, thirty-six thousand, two hundred five".