21222223355464 has 16 divisors (see below), whose sum is σ = 39792226880700. Its totient is φ = 10610962853952.

The previous prime is 21222223355413. The next prime is 21222223355539. The reversal of 21222223355464 is 46455332222212.

It can be written as a sum of positive squares in 2 ways, for example, as 20869456256100 + 352767099364 = 4568310^2 + 593942^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21222223355464.

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, 17995759 + ... + 19138750.

Almost surely, 2^{21222223355464} is an apocalyptic number.

It is an amenable number.

21222223355464 is a deficient number, since it is larger than the sum of its proper divisors (18570003525236).

21222223355464 is a wasteful number, since it uses less digits than its factorization.

21222223355464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37205952 (or 37205948 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 43.

Adding to 21222223355464 its reverse (46455332222212), we get a palindrome (67677555577676).

The spelling of 21222223355464 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-three million, three hundred fifty-five thousand, four hundred sixty-four".