21142120430 has 32 divisors (see below), whose sum is σ = 38422909440. Its totient is φ = 8375662080.

The previous prime is 21142120429. The next prime is 21142120463. The reversal of 21142120430 is 3402124112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 413222 + ... + 461558.

It is an arithmetic number, because the mean of its divisors is an integer number (1200715920).

Almost surely, 2^21142120430 is an apocalyptic number.

21142120430 is a deficient number, since it is larger than the sum of its proper divisors (17280789010).

21142120430 is a wasteful number, since it uses less digits than its factorization.

21142120430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48764.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21142120430 its reverse (3402124112), we get a palindrome (24544244542).

The spelling of 21142120430 in words is "twenty-one billion, one hundred forty-two million, one hundred twenty thousand, four hundred thirty".