21215054053 has 8 divisors (see below), whose sum is σ = 21302026200. Its totient is φ = 21128163840.

The previous prime is 21215054051. The next prime is 21215054057. The reversal of 21215054053 is 35045051212.

It can be written as a sum of positive squares in 4 ways, for example, as 3357275364 + 17857778689 = 57942^2 + 133633^2 .

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 21215054053 - 2¹ = 21215054051 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21215054051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528301 + ... + 567037.

It is an arithmetic number, because the mean of its divisors is an integer number (2662753275).

Almost surely, 2^21215054053 is an apocalyptic number.

It is an amenable number.

21215054053 is a deficient number, since it is larger than the sum of its proper divisors (86972147).

21215054053 is a wasteful number, since it uses less digits than its factorization.

21215054053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40967.

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 21215054053 in words is "twenty-one billion, two hundred fifteen million, fifty-four thousand, fifty-three".