21120780190226 has 32 divisors (see below), whose sum is σ = 31808058510000. Its totient is φ = 10518185373696.

The previous prime is 21120780190219. The next prime is 21120780190253. The reversal of 21120780190226 is 62209108702112.

It is a Cunningham number, because it is equal to 4595735²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 6724940376001 + 14395839814225 = 2593249^2 + 3794185^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1643250416 + ... + 1643263268.

Almost surely, 2^{21120780190226} is an apocalyptic number.

21120780190226 is a deficient number, since it is larger than the sum of its proper divisors (10687278319774).

21120780190226 is a wasteful number, since it uses less digits than its factorization.

21120780190226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16158.

The product of its (nonzero) digits is 48384, while the sum is 41.

Adding to 21120780190226 its reverse (62209108702112), we get a palindrome (83329888892338).

The spelling of 21120780190226 in words is "twenty-one trillion, one hundred twenty billion, seven hundred eighty million, one hundred ninety thousand, two hundred twenty-six".