21151251222 has 8 divisors (see below), whose sum is σ = 42302502456. Its totient is φ = 7050417072.

The previous prime is 21151251211. The next prime is 21151251313. The reversal of 21151251222 is 22215215112.

21151251222 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

21151251222 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21151251192 and 21151251201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1762604263 + ... + 1762604274.

It is an arithmetic number, because the mean of its divisors is an integer number (5287812807).

Almost surely, 2^21151251222 is an apocalyptic number.

21151251222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21151251222 is a wasteful number, since it uses less digits than its factorization.

21151251222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3525208542.

The product of its digits is 800, while the sum is 24.

Adding to 21151251222 its reverse (22215215112), we get a palindrome (43366466334).

The spelling of 21151251222 in words is "twenty-one billion, one hundred fifty-one million, two hundred fifty-one thousand, two hundred twenty-two".