21440122423402 has 4 divisors (see below), whose sum is σ = 32160183635106. Its totient is φ = 10720061211700.

The previous prime is 21440122423361. The next prime is 21440122423427. The reversal of 21440122423402 is 20432422104412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16852511042761 + 4587611380641 = 4105181^2 + 2141871^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5360030605849 + ... + 5360030605852.

Almost surely, 2^{21440122423402} is an apocalyptic number.

21440122423402 is a deficient number, since it is larger than the sum of its proper divisors (10720061211704).

21440122423402 is a wasteful number, since it uses less digits than its factorization.

21440122423402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10720061211703.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 21440122423402 its reverse (20432422104412), we get a palindrome (41872544527814).

The spelling of 21440122423402 in words is "twenty-one trillion, four hundred forty billion, one hundred twenty-two million, four hundred twenty-three thousand, four hundred two".