21231455435 has 8 divisors (see below), whose sum is σ = 25478841696. Its totient is φ = 16984434240.

The previous prime is 21231455423. The next prime is 21231455489. The reversal of 21231455435 is 53455413212.

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

It is not a de Polignac number, because 21231455435 - 2¹⁴ = 21231439051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21231455395 and 21231455404.

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, 59255 + ... + 214415.

It is an arithmetic number, because the mean of its divisors is an integer number (3184855212).

Almost surely, 2^21231455435 is an apocalyptic number.

21231455435 is a deficient number, since it is larger than the sum of its proper divisors (4247386261).

21231455435 is a wasteful number, since it uses less digits than its factorization.

21231455435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182533.

The product of its digits is 72000, while the sum is 35.

Adding to 21231455435 its reverse (53455413212), we get a palindrome (74686868647).

The spelling of 21231455435 in words is "twenty-one billion, two hundred thirty-one million, four hundred fifty-five thousand, four hundred thirty-five".