21001311122 has 32 divisors (see below), whose sum is σ = 34621893504. Its totient is φ = 9475177600.

The previous prime is 21001311101. The next prime is 21001311137. The reversal of 21001311122 is 22111310012.

It is a junction number, because it is equal to n+sod(n) for n = 21001311097 and 21001311106.

It is an unprimeable number.

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, 1619408 + ... + 1632324.

It is an arithmetic number, because the mean of its divisors is an integer number (1081934172).

Almost surely, 2^21001311122 is an apocalyptic number.

21001311122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21001311122 is a deficient number, since it is larger than the sum of its proper divisors (13620582382).

21001311122 is a wasteful number, since it uses less digits than its factorization.

21001311122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13474.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21001311122 its reverse (22111310012), we get a palindrome (43112621134).

The spelling of 21001311122 in words is "twenty-one billion, one million, three hundred eleven thousand, one hundred twenty-two".