21121111002122 has 8 divisors (see below), whose sum is σ = 31687772062500. Its totient is φ = 10558520314624.

The previous prime is 21121111002091. The next prime is 21121111002157. The reversal of 21121111002122 is 22120011112112.

It can be written as a sum of positive squares in 2 ways, for example, as 20878603014721 + 242507987401 = 4569311^2 + 492451^2 .

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

It is a super-2 number, since 2×21121111002122² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121111002122.

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, 1017580247 + ... + 1017601002.

Almost surely, 2^{21121111002122} is an apocalyptic number.

21121111002122 is a deficient number, since it is larger than the sum of its proper divisors (10566661060378).

21121111002122 is a wasteful number, since it uses less digits than its factorization.

21121111002122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035186440.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21121111002122 its reverse (22120011112112), we get a palindrome (43241122114234).

The spelling of 21121111002122 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, two thousand, one hundred twenty-two".