21332144240402 has 4 divisors (see below), whose sum is σ = 31998216360606. Its totient is φ = 10666072120200.

The previous prime is 21332144240401. The next prime is 21332144240453. The reversal of 21332144240402 is 20404244123312.

It is a happy number.

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., 14792877514801 + 6539266725601 = 3846151^2 + 2557199^2 .

It is not an unprimeable number, because it can be changed into a prime (21332144240401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5333036060099 + ... + 5333036060102.

Almost surely, 2^{21332144240402} is an apocalyptic number.

21332144240402 is a deficient number, since it is larger than the sum of its proper divisors (10666072120204).

21332144240402 is a wasteful number, since it uses less digits than its factorization.

21332144240402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10666072120203.

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 21332144240402 its reverse (20404244123312), we get a palindrome (41736388363714).

The spelling of 21332144240402 in words is "twenty-one trillion, three hundred thirty-two billion, one hundred forty-four million, two hundred forty thousand, four hundred two".