21400350309 has 16 divisors (see below), whose sum is σ = 34143009600. Its totient is φ = 13169446128.

The previous prime is 21400350289. The next prime is 21400350319. The reversal of 21400350309 is 90305300412.

21400350309 is a `hidden beast` number, since 2 + 1 + 4 + 0 + 0 + 350 + 309 = 666.

It is not a de Polignac number, because 21400350309 - 2¹⁷ = 21400219237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400350319) 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, 30484479 + ... + 30485180.

It is an arithmetic number, because the mean of its divisors is an integer number (2133938100).

Almost surely, 2^21400350309 is an apocalyptic number.

It is an amenable number.

21400350309 is a deficient number, since it is larger than the sum of its proper divisors (12742659291).

21400350309 is a wasteful number, since it uses less digits than its factorization.

21400350309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60969681 (or 60969675 counting only the distinct ones).

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

The spelling of 21400350309 in words is "twenty-one billion, four hundred million, three hundred fifty thousand, three hundred nine".