21042340204 has 6 divisors (see below), whose sum is σ = 36824095364. Its totient is φ = 10521170100.

The previous prime is 21042340159. The next prime is 21042340261. The reversal of 21042340204 is 40204324012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630292522 + ... + 2630292529.

Almost surely, 2^21042340204 is an apocalyptic number.

It is an amenable number.

21042340204 is a deficient number, since it is larger than the sum of its proper divisors (15781755160).

21042340204 is a wasteful number, since it uses less digits than its factorization.

21042340204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5260585055 (or 5260585053 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21042340204 its reverse (40204324012), we get a palindrome (61246664216).

The spelling of 21042340204 in words is "twenty-one billion, forty-two million, three hundred forty thousand, two hundred four".