21111033122 has 4 divisors (see below), whose sum is σ = 31666549686. Its totient is φ = 10555516560.

The previous prime is 21111033107. The next prime is 21111033191. The reversal of 21111033122 is 22133011112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19493465161 + 1617567961 = 139619^2 + 40219^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21111033122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277758279 + ... + 5277758282.

Almost surely, 2^21111033122 is an apocalyptic number.

21111033122 is a deficient number, since it is larger than the sum of its proper divisors (10555516564).

21111033122 is a wasteful number, since it uses less digits than its factorization.

21111033122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10555516563.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21111033122 its reverse (22133011112), we get a palindrome (43244044234).

The spelling of 21111033122 in words is "twenty-one billion, one hundred eleven million, thirty-three thousand, one hundred twenty-two".