21213405435052 has 12 divisors (see below), whose sum is σ = 37127197719976. Its totient is φ = 10605634657920.

The previous prime is 21213405435041. The next prime is 21213405435091. The reversal of 21213405435052 is 25053450431212.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266970213 + ... + 267049660.

Almost surely, 2^{21213405435052} is an apocalyptic number.

It is an amenable number.

21213405435052 is a deficient number, since it is larger than the sum of its proper divisors (15913792284924).

21213405435052 is a wasteful number, since it uses less digits than its factorization.

21213405435052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534029808 (or 534029806 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

Adding to 21213405435052 its reverse (25053450431212), we get a palindrome (46266855866264).

The spelling of 21213405435052 in words is "twenty-one trillion, two hundred thirteen billion, four hundred five million, four hundred thirty-five thousand, fifty-two".