21221535434012 has 24 divisors (see below), whose sum is σ = 37799980957200. Its totient is φ = 10422448439040.

The previous prime is 21221535433933. The next prime is 21221535434081. The reversal of 21221535434012 is 21043453512212.

It is a super-2 number, since 2×21221535434012² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 113351789 + ... + 113538852.

It is an arithmetic number, because the mean of its divisors is an integer number (1574999206550).

Almost surely, 2^{21221535434012} is an apocalyptic number.

It is an amenable number.

21221535434012 is a deficient number, since it is larger than the sum of its proper divisors (16578445523188).

21221535434012 is a wasteful number, since it uses less digits than its factorization.

21221535434012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226891061 (or 226891059 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 21221535434012 its reverse (21043453512212), we get a palindrome (42264988946224).

The spelling of 21221535434012 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred thirty-five million, four hundred thirty-four thousand, twelve".