21606031350 has 72 divisors (see below), whose sum is σ = 58127230512. Its totient is φ = 5753764800.

The previous prime is 21606031319. The next prime is 21606031351. The reversal of 21606031350 is 5313060612.

21606031350 is a `hidden beast` number, since 2 + 1 + 6 + 0 + 603 + 1 + 3 + 50 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21606031351) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 302040 + ... + 366660.

It is an arithmetic number, because the mean of its divisors is an integer number (807322646).

Almost surely, 2^21606031350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21606031350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29063615256).

21606031350 is an abundant number, since it is smaller than the sum of its proper divisors (36521199162).

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

21606031350 is a wasteful number, since it uses less digits than its factorization.

21606031350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65382 (or 65374 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

Adding to 21606031350 its reverse (5313060612), we get a palindrome (26919091962).

The spelling of 21606031350 in words is "twenty-one billion, six hundred six million, thirty-one thousand, three hundred fifty".