21442313402 has 4 divisors (see below), whose sum is σ = 32163470106. Its totient is φ = 10721156700.

The previous prime is 21442313381. The next prime is 21442313407. The reversal of 21442313402 is 20431324412.

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., 20309385121 + 1132928281 = 142511^2 + 33659^2 .

It is not an unprimeable number, because it can be changed into a prime (21442313407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5360578349 + ... + 5360578352.

Almost surely, 2^21442313402 is an apocalyptic number.

21442313402 is a deficient number, since it is larger than the sum of its proper divisors (10721156704).

21442313402 is a wasteful number, since it uses less digits than its factorization.

21442313402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10721156703.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21442313402 its reverse (20431324412), we get a palindrome (41873637814).

The spelling of 21442313402 in words is "twenty-one billion, four hundred forty-two million, three hundred thirteen thousand, four hundred two".