21151423250 has 32 divisors (see below), whose sum is σ = 39615623424. Its totient is φ = 8456262000.

The previous prime is 21151423217. The next prime is 21151423253. The reversal of 21151423250 is 5232415112.

It is not an unprimeable number, because it can be changed into a prime (21151423253) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 495245 + ... + 536255.

It is an arithmetic number, because the mean of its divisors is an integer number (1237988232).

Almost surely, 2^21151423250 is an apocalyptic number.

21151423250 is a deficient number, since it is larger than the sum of its proper divisors (18464200174).

21151423250 is a wasteful number, since it uses less digits than its factorization.

21151423250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43091 (or 43081 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21151423250 its reverse (5232415112), we get a palindrome (26383838362).

The spelling of 21151423250 in words is "twenty-one billion, one hundred fifty-one million, four hundred twenty-three thousand, two hundred fifty".