21131024342 has 8 divisors (see below), whose sum is σ = 32553199776. Its totient is φ = 10279957752.

The previous prime is 21131024329. The next prime is 21131024441. The reversal of 21131024342 is 24342013112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142777118 + ... + 142777265.

It is an arithmetic number, because the mean of its divisors is an integer number (4069149972).

Almost surely, 2^21131024342 is an apocalyptic number.

21131024342 is a deficient number, since it is larger than the sum of its proper divisors (11422175434).

21131024342 is a wasteful number, since it uses less digits than its factorization.

21131024342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285554422.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21131024342 its reverse (24342013112), we get a palindrome (45473037454).

The spelling of 21131024342 in words is "twenty-one billion, one hundred thirty-one million, twenty-four thousand, three hundred forty-two".