21152212222 has 8 divisors (see below), whose sum is σ = 32175196272. Its totient is φ = 10427146800.

The previous prime is 21152212069. The next prime is 21152212303. The reversal of 21152212222 is 22221225112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21152212193 and 21152212202.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 74479479 + ... + 74479762.

It is an arithmetic number, because the mean of its divisors is an integer number (4021899534).

Almost surely, 2^21152212222 is an apocalyptic number.

21152212222 is a deficient number, since it is larger than the sum of its proper divisors (11022984050).

21152212222 is a wasteful number, since it uses less digits than its factorization.

21152212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148959314.

The product of its digits is 640, while the sum is 22.

Adding to 21152212222 its reverse (22221225112), we get a palindrome (43373437334).

The spelling of 21152212222 in words is "twenty-one billion, one hundred fifty-two million, two hundred twelve thousand, two hundred twenty-two".