21240162402 has 8 divisors (see below), whose sum is σ = 42480324816. Its totient is φ = 7080054132.

The previous prime is 21240162373. The next prime is 21240162413. The reversal of 21240162402 is 20426104212.

It is a happy number.

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

21240162402 is an admirable number.

It is a super-2 number, since 2×21240162402² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1770013528 + ... + 1770013539.

It is an arithmetic number, because the mean of its divisors is an integer number (5310040602).

Almost surely, 2^21240162402 is an apocalyptic number.

21240162402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21240162402 is a wasteful number, since it uses less digits than its factorization.

21240162402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3540027072.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21240162402 its reverse (20426104212), we get a palindrome (41666266614).

The spelling of 21240162402 in words is "twenty-one billion, two hundred forty million, one hundred sixty-two thousand, four hundred two".