21001222466 has 16 divisors (see below), whose sum is σ = 36156616704. Its totient is φ = 8961893664.

The previous prime is 21001222453. The next prime is 21001222507. The reversal of 21001222466 is 66422210012.

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, 3215810 + ... + 3222333.

It is an arithmetic number, because the mean of its divisors is an integer number (2259788544).

Almost surely, 2^21001222466 is an apocalyptic number.

21001222466 is a deficient number, since it is larger than the sum of its proper divisors (15155394238).

21001222466 is a wasteful number, since it uses less digits than its factorization.

21001222466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6438385.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21001222466 its reverse (66422210012), we get a palindrome (87423432478).

The spelling of 21001222466 in words is "twenty-one billion, one million, two hundred twenty-two thousand, four hundred sixty-six".