21140350 has 144 divisors (see below), whose sum is σ = 54817920. Its totient is φ = 5875200.

The previous prime is 21140341. The next prime is 21140351. The reversal of 21140350 is 5304112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1112641 + ... + 1112659.

It is an arithmetic number, because the mean of its divisors is an integer number (380680).

Almost surely, 2^21140350 is an apocalyptic number.

21140350 is an abundant number, since it is smaller than the sum of its proper divisors (33677570).

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

21140350 is a wasteful number, since it uses less digits than its factorization.

21140350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21140350 is about 4597.8636343415. The cubic root of 21140350 is about 276.5056804443.

Adding to 21140350 its reverse (5304112), we get a palindrome (26444462).

The spelling of 21140350 in words is "twenty-one million, one hundred forty thousand, three hundred fifty".