21011550053 has 16 divisors (see below), whose sum is σ = 23158047360. Its totient is φ = 18944991936.

The previous prime is 21011550037. The next prime is 21011550097. The reversal of 21011550053 is 35005511012.

It is a happy number.

It is not a de Polignac number, because 21011550053 - 2⁴ = 21011550037 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 (21011550013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33176 + ... + 207662.

It is an arithmetic number, because the mean of its divisors is an integer number (1447377960).

Almost surely, 2^21011550053 is an apocalyptic number.

It is an amenable number.

21011550053 is a deficient number, since it is larger than the sum of its proper divisors (2146497307).

21011550053 is a wasteful number, since it uses less digits than its factorization.

21011550053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174716.

The product of its (nonzero) digits is 750, while the sum is 23.

The spelling of 21011550053 in words is "twenty-one billion, eleven million, five hundred fifty thousand, fifty-three".