21241404342 has 48 divisors (see below), whose sum is σ = 46998186768. Its totient is φ = 6931055040.

The previous prime is 21241404299. The next prime is 21241404343. The reversal of 21241404342 is 24340414212.

21241404342 is a `hidden beast` number, since 212 + 4 + 1 + 404 + 3 + 42 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241404343) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 397492 + ... + 447752.

It is an arithmetic number, because the mean of its divisors is an integer number (979128891).

Almost surely, 2^21241404342 is an apocalyptic number.

21241404342 is an abundant number, since it is smaller than the sum of its proper divisors (25756782426).

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

21241404342 is a wasteful number, since it uses less digits than its factorization.

21241404342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50765 (or 50762 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21241404342 its reverse (24340414212), we get a palindrome (45581818554).

The spelling of 21241404342 in words is "twenty-one billion, two hundred forty-one million, four hundred four thousand, three hundred forty-two".