21444122402 has 8 divisors (see below), whose sum is σ = 32168624796. Its totient is φ = 10721247472.

The previous prime is 21444122377. The next prime is 21444122411. The reversal of 21444122402 is 20422144412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13027711321 + 8416411081 = 114139^2 + 91741^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 373373 + ... + 426960.

Almost surely, 2^21444122402 is an apocalyptic number.

21444122402 is a deficient number, since it is larger than the sum of its proper divisors (10724502394).

21444122402 is a wasteful number, since it uses less digits than its factorization.

21444122402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813732.

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 21444122402 its reverse (20422144412), we get a palindrome (41866266814).

The spelling of 21444122402 in words is "twenty-one billion, four hundred forty-four million, one hundred twenty-two thousand, four hundred two".