21420210134 has 8 divisors (see below), whose sum is σ = 32131316520. Its totient is φ = 10709771296.

The previous prime is 21420210113. The next prime is 21420210167. The reversal of 21420210134 is 43101202412.

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, 76979 + ... + 220830.

It is an arithmetic number, because the mean of its divisors is an integer number (4016414565).

Almost surely, 2^21420210134 is an apocalyptic number.

21420210134 is a deficient number, since it is larger than the sum of its proper divisors (10711106386).

21420210134 is a wasteful number, since it uses less digits than its factorization.

21420210134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333774.

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

Adding to 21420210134 its reverse (43101202412), we get a palindrome (64521412546).

The spelling of 21420210134 in words is "twenty-one billion, four hundred twenty million, two hundred ten thousand, one hundred thirty-four".