21051140434 has 8 divisors (see below), whose sum is σ = 31957153200. Its totient is φ = 10398756036.

The previous prime is 21051140413. The next prime is 21051140441. The reversal of 21051140434 is 43404115012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21051140399 and 21051140408.

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, 63406884 + ... + 63407215.

It is an arithmetic number, because the mean of its divisors is an integer number (3994644150).

Almost surely, 2^21051140434 is an apocalyptic number.

21051140434 is a deficient number, since it is larger than the sum of its proper divisors (10906012766).

21051140434 is a wasteful number, since it uses less digits than its factorization.

21051140434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126814184.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21051140434 its reverse (43404115012), we get a palindrome (64455255446).

The spelling of 21051140434 in words is "twenty-one billion, fifty-one million, one hundred forty thousand, four hundred thirty-four".