21051454342 has 4 divisors (see below), whose sum is σ = 31577181516. Its totient is φ = 10525727170.

The previous prime is 21051454321. The next prime is 21051454367. The reversal of 21051454342 is 24345415012.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 5262863584 + ... + 5262863587.

It is an arithmetic number, because the mean of its divisors is an integer number (7894295379).

Almost surely, 2^21051454342 is an apocalyptic number.

21051454342 is a deficient number, since it is larger than the sum of its proper divisors (10525727174).

21051454342 is a wasteful number, since it uses less digits than its factorization.

21051454342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10525727173.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 21051454342 its reverse (24345415012), we get a palindrome (45396869354).

The spelling of 21051454342 in words is "twenty-one billion, fifty-one million, four hundred fifty-four thousand, three hundred forty-two".