21355135050023 has 32 divisors (see below), whose sum is σ = 22674220800000. Its totient is φ = 20056131919872.

The previous prime is 21355135049977. The next prime is 21355135050079. The reversal of 21355135050023 is 32005053155312.

It is a cyclic number.

It is not a de Polignac number, because 21355135050023 - 2¹² = 21355135045927 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 (21355135050083) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5449126658 + ... + 5449130576.

It is an arithmetic number, because the mean of its divisors is an integer number (708569400000).

Almost surely, 2^{21355135050023} is an apocalyptic number.

21355135050023 is a deficient number, since it is larger than the sum of its proper divisors (1319085749977).

21355135050023 is a wasteful number, since it uses less digits than its factorization.

21355135050023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7359.

The product of its (nonzero) digits is 67500, while the sum is 35.

The spelling of 21355135050023 in words is "twenty-one trillion, three hundred fifty-five billion, one hundred thirty-five million, fifty thousand, twenty-three".