21111210122 has 8 divisors (see below), whose sum is σ = 31695372900. Its totient is φ = 10546085824.

The previous prime is 21111210119. The next prime is 21111210161. The reversal of 21111210122 is 22101211112.

It can be written as a sum of positive squares in 2 ways, for example, as 21057202321 + 54007801 = 145111^2 + 7349^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21111210097 and 21111210106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4756847 + ... + 4761282.

Almost surely, 2^21111210122 is an apocalyptic number.

21111210122 is a deficient number, since it is larger than the sum of its proper divisors (10584162778).

21111210122 is a wasteful number, since it uses less digits than its factorization.

21111210122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9519240.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111210122 its reverse (22101211112), we get a palindrome (43212421234).

The spelling of 21111210122 in words is "twenty-one billion, one hundred eleven million, two hundred ten thousand, one hundred twenty-two".