21123400150 has 72 divisors (see below), whose sum is σ = 42006972096. Its totient is φ = 7900838400.

The previous prime is 21123400147. The next prime is 21123400171. The reversal of 21123400150 is 5100432112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2263995 + ... + 2273305.

It is an arithmetic number, because the mean of its divisors is an integer number (583430168).

Almost surely, 2^21123400150 is an apocalyptic number.

21123400150 is a deficient number, since it is larger than the sum of its proper divisors (20883571946).

21123400150 is a wasteful number, since it uses less digits than its factorization.

21123400150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9514 (or 9492 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21123400150 its reverse (5100432112), we get a palindrome (26223832262).

The spelling of 21123400150 in words is "twenty-one billion, one hundred twenty-three million, four hundred thousand, one hundred fifty".