21420034235 has 8 divisors (see below), whose sum is σ = 25704914640. Its totient is φ = 17135445024.

The previous prime is 21420034177. The next prime is 21420034243. The reversal of 21420034235 is 53243002412.

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

It is a cyclic number.

It is not a de Polignac number, because 21420034235 - 2¹⁸ = 21419772091 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152336 + ... + 256994.

It is an arithmetic number, because the mean of its divisors is an integer number (3213114330).

Almost surely, 2^21420034235 is an apocalyptic number.

21420034235 is a deficient number, since it is larger than the sum of its proper divisors (4284880405).

21420034235 is a wasteful number, since it uses less digits than its factorization.

21420034235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145597.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 21420034235 its reverse (53243002412), we get a palindrome (74663036647).

The spelling of 21420034235 in words is "twenty-one billion, four hundred twenty million, thirty-four thousand, two hundred thirty-five".