21222215350 has 48 divisors (see below), whose sum is σ = 45161618400. Its totient is φ = 7268244480.

The previous prime is 21222215291. The next prime is 21222215351. The reversal of 21222215350 is 5351222212.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222215351) 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 23 ways as a sum of consecutive naturals, for example, 292516 + ... + 357784.

It is an arithmetic number, because the mean of its divisors is an integer number (940867050).

Almost surely, 2^21222215350 is an apocalyptic number.

21222215350 is an abundant number, since it is smaller than the sum of its proper divisors (23939403050).

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

21222215350 is a wasteful number, since it uses less digits than its factorization.

21222215350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66217 (or 66212 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21222215350 its reverse (5351222212), we get a palindrome (26573437562).

The spelling of 21222215350 in words is "twenty-one billion, two hundred twenty-two million, two hundred fifteen thousand, three hundred fifty".