21230255342 has 4 divisors (see below), whose sum is σ = 31845383016. Its totient is φ = 10615127670.

The previous prime is 21230255329. The next prime is 21230255369. The reversal of 21230255342 is 24355203212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5307563834 + ... + 5307563837.

It is an arithmetic number, because the mean of its divisors is an integer number (7961345754).

Almost surely, 2^21230255342 is an apocalyptic number.

21230255342 is a deficient number, since it is larger than the sum of its proper divisors (10615127674).

21230255342 is a wasteful number, since it uses less digits than its factorization.

21230255342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10615127673.

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 21230255342 its reverse (24355203212), we get a palindrome (45585458554).

The spelling of 21230255342 in words is "twenty-one billion, two hundred thirty million, two hundred fifty-five thousand, three hundred forty-two".