21121002226 has 8 divisors (see below), whose sum is σ = 32537760300. Its totient is φ = 10275082128.

The previous prime is 21121002211. The next prime is 21121002233. The reversal of 21121002226 is 62220012112.

It can be written as a sum of positive squares in 2 ways, for example, as 19839004201 + 1281998025 = 140851^2 + 35805^2 .

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

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, 142709401 + ... + 142709548.

Almost surely, 2^21121002226 is an apocalyptic number.

21121002226 is a deficient number, since it is larger than the sum of its proper divisors (11416758074).

21121002226 is a wasteful number, since it uses less digits than its factorization.

21121002226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285418988.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21121002226 its reverse (62220012112), we get a palindrome (83341014338).

The spelling of 21121002226 in words is "twenty-one billion, one hundred twenty-one million, two thousand, two hundred twenty-six".