21202444402 has 8 divisors (see below), whose sum is σ = 32100897456. Its totient is φ = 10502145252.

The previous prime is 21202444391. The next prime is 21202444423. The reversal of 21202444402 is 20444420212.

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

It is a super-2 number, since 2×21202444402² (a number of 21 digits) contains 22 as substring.

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, 49538208 + ... + 49538635.

It is an arithmetic number, because the mean of its divisors is an integer number (4012612182).

Almost surely, 2^21202444402 is an apocalyptic number.

21202444402 is a deficient number, since it is larger than the sum of its proper divisors (10898453054).

21202444402 is a wasteful number, since it uses less digits than its factorization.

21202444402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99076952.

The product of its (nonzero) digits is 4096, while the sum is 25.

Adding to 21202444402 its reverse (20444420212), we get a palindrome (41646864614).

The spelling of 21202444402 in words is "twenty-one billion, two hundred two million, four hundred forty-four thousand, four hundred two".