21406023313650 has 144 divisors (see below), whose sum is σ = 57807950054400. Its totient is φ = 5678792064000.

The previous prime is 21406023313567. The next prime is 21406023313651. The reversal of 21406023313650 is 5631332060412.

21406023313650 is a `hidden beast` number, since 2 + 1 + 4 + 0 + 60 + 233 + 1 + 365 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (21406023313651) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 922622050 + ... + 922645250.

It is an arithmetic number, because the mean of its divisors is an integer number (401444097600).

Almost surely, 2^{21406023313650} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21406023313650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28903975027200).

21406023313650 is an abundant number, since it is smaller than the sum of its proper divisors (36401926740750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21406023313650 is a wasteful number, since it uses less digits than its factorization.

21406023313650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33721 (or 33713 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The spelling of 21406023313650 in words is "twenty-one trillion, four hundred six billion, twenty-three million, three hundred thirteen thousand, six hundred fifty".