21167210722 has 32 divisors (see below), whose sum is σ = 37550718720. Its totient is φ = 8755857600.

The previous prime is 21167210677. The next prime is 21167210747. The reversal of 21167210722 is 22701276112.

It is a super-2 number, since 2×21167210722² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1495563 + ... + 1509649.

It is an arithmetic number, because the mean of its divisors is an integer number (1173459960).

Almost surely, 2^21167210722 is an apocalyptic number.

21167210722 is a deficient number, since it is larger than the sum of its proper divisors (16383507998).

21167210722 is a wasteful number, since it uses less digits than its factorization.

21167210722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17826.

The product of its (nonzero) digits is 4704, while the sum is 31.

Adding to 21167210722 its reverse (22701276112), we get a palindrome (43868486834).

The spelling of 21167210722 in words is "twenty-one billion, one hundred sixty-seven million, two hundred ten thousand, seven hundred twenty-two".