21421033235 has 32 divisors (see below), whose sum is σ = 29617201152. Its totient is φ = 14569309440.

The previous prime is 21421033211. The next prime is 21421033247. The reversal of 21421033235 is 53233012412.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21421033235 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2188322 + ... + 2198088.

It is an arithmetic number, because the mean of its divisors is an integer number (925537536).

Almost surely, 2^21421033235 is an apocalyptic number.

21421033235 is a deficient number, since it is larger than the sum of its proper divisors (8196167917).

21421033235 is a wasteful number, since it uses less digits than its factorization.

21421033235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10283.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21421033235 its reverse (53233012412), we get a palindrome (74654045647).

The spelling of 21421033235 in words is "twenty-one billion, four hundred twenty-one million, thirty-three thousand, two hundred thirty-five".