21222200745 has 16 divisors (see below), whose sum is σ = 37728357120. Its totient is φ = 11318506992.

The previous prime is 21222200707. The next prime is 21222200749. The reversal of 21222200745 is 54700222212.

It is not a de Polignac number, because 21222200745 - 2³¹ = 19074717097 is a prime.

It is a super-2 number, since 2×21222200745² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21222200749) 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, 78600609 + ... + 78600878.

It is an arithmetic number, because the mean of its divisors is an integer number (2358022320).

Almost surely, 2^21222200745 is an apocalyptic number.

It is an amenable number.

21222200745 is a deficient number, since it is larger than the sum of its proper divisors (16506156375).

21222200745 is a wasteful number, since it uses less digits than its factorization.

21222200745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157201501 (or 157201495 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

Adding to 21222200745 its reverse (54700222212), we get a palindrome (75922422957).

The spelling of 21222200745 in words is "twenty-one billion, two hundred twenty-two million, two hundred thousand, seven hundred forty-five".