21110340202442 has 8 divisors (see below), whose sum is σ = 31665965522436. Its totient is φ = 10555018361632.

The previous prime is 21110340202387. The next prime is 21110340202451. The reversal of 21110340202442 is 24420204301112.

It can be written as a sum of positive squares in 2 ways, for example, as 20979505354921 + 130834847521 = 4580339^2 + 361711^2 .

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, 75695813 + ... + 75974184.

Almost surely, 2^{21110340202442} is an apocalyptic number.

21110340202442 is a deficient number, since it is larger than the sum of its proper divisors (10555625319994).

21110340202442 is a wasteful number, since it uses less digits than its factorization.

21110340202442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151739592.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21110340202442 its reverse (24420204301112), we get a palindrome (45530544503554).

The spelling of 21110340202442 in words is "twenty-one trillion, one hundred ten billion, three hundred forty million, two hundred two thousand, four hundred forty-two".