21222421246 has 16 divisors (see below), whose sum is σ = 34343288784. Its totient is φ = 9777559104.

The previous prime is 21222421201. The next prime is 21222421277. The reversal of 21222421246 is 64212422212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 710271 + ... + 739546.

It is an arithmetic number, because the mean of its divisors is an integer number (2146455549).

Almost surely, 2^21222421246 is an apocalyptic number.

21222421246 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21222421246 is a deficient number, since it is larger than the sum of its proper divisors (13120867538).

21222421246 is a wasteful number, since it uses less digits than its factorization.

21222421246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450395.

The product of its digits is 6144, while the sum is 28.

Adding to 21222421246 its reverse (64212422212), we get a palindrome (85434843458).

The spelling of 21222421246 in words is "twenty-one billion, two hundred twenty-two million, four hundred twenty-one thousand, two hundred forty-six".