21220135292 has 12 divisors (see below), whose sum is σ = 37137698976. Its totient is φ = 10609364160.

The previous prime is 21220135291. The next prime is 21220135297. The reversal of 21220135292 is 29253102212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220135291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104813 + ... + 231140.

It is an arithmetic number, because the mean of its divisors is an integer number (3094808248).

Almost surely, 2^21220135292 is an apocalyptic number.

It is an amenable number.

21220135292 is a deficient number, since it is larger than the sum of its proper divisors (15917563684).

21220135292 is a wasteful number, since it uses less digits than its factorization.

21220135292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351748 (or 351746 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21220135292 in words is "twenty-one billion, two hundred twenty million, one hundred thirty-five thousand, two hundred ninety-two".