21151243350 has 72 divisors (see below), whose sum is σ = 57789571320. Its totient is φ = 5544725760.

The previous prime is 21151243349. The next prime is 21151243357. The reversal of 21151243350 is 5334215112.

21151243350 is a `hidden beast` number, since 21 + 1 + 51 + 243 + 350 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151243357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 371779 + ... + 424878.

It is an arithmetic number, because the mean of its divisors is an integer number (802632935).

Almost surely, 2^21151243350 is an apocalyptic number.

21151243350 is an abundant number, since it is smaller than the sum of its proper divisors (36638327970).

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

21151243350 is a wasteful number, since it uses less digits than its factorization.

21151243350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796734 (or 796726 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 21151243350 its reverse (5334215112), we get a palindrome (26485458462).

The spelling of 21151243350 in words is "twenty-one billion, one hundred fifty-one million, two hundred forty-three thousand, three hundred fifty".