21440152346 has 16 divisors (see below), whose sum is σ = 32218847808. Its totient is φ = 10700553600.

The previous prime is 21440152343. The next prime is 21440152373. The reversal of 21440152346 is 64325104412.

It is not an unprimeable number, because it can be changed into a prime (21440152343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4057226 + ... + 4062506.

It is an arithmetic number, because the mean of its divisors is an integer number (2013677988).

Almost surely, 2^21440152346 is an apocalyptic number.

21440152346 is a deficient number, since it is larger than the sum of its proper divisors (10778695462).

21440152346 is a wasteful number, since it uses less digits than its factorization.

21440152346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8597.

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 21440152346 its reverse (64325104412), we get a palindrome (85765256758).

The spelling of 21440152346 in words is "twenty-one billion, four hundred forty million, one hundred fifty-two thousand, three hundred forty-six".