21221343435 has 32 divisors (see below), whose sum is σ = 34133605632. Its totient is φ = 11258352000.

The previous prime is 21221343421. The next prime is 21221343439. The reversal of 21221343435 is 53434312212.

It is not a de Polignac number, because 21221343435 - 2⁴ = 21221343419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221343439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3298692 + ... + 3305118.

It is an arithmetic number, because the mean of its divisors is an integer number (1066675176).

Almost surely, 2^21221343435 is an apocalyptic number.

21221343435 is a deficient number, since it is larger than the sum of its proper divisors (12912262197).

21221343435 is a wasteful number, since it uses less digits than its factorization.

21221343435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7563.

The product of its digits is 17280, while the sum is 30.

Adding to 21221343435 its reverse (53434312212), we get a palindrome (74655655647).

The spelling of 21221343435 in words is "twenty-one billion, two hundred twenty-one million, three hundred forty-three thousand, four hundred thirty-five".