21221440412434 has 4 divisors (see below), whose sum is σ = 31832160618654. Its totient is φ = 10610720206216.

The previous prime is 21221440412411. The next prime is 21221440412441. The reversal of 21221440412434 is 43421404412212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20557292020225 + 664148392209 = 4534015^2 + 814953^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21221440412434.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305360103107 + ... + 5305360103110.

Almost surely, 2^{21221440412434} is an apocalyptic number.

21221440412434 is a deficient number, since it is larger than the sum of its proper divisors (10610720206220).

21221440412434 is a wasteful number, since it uses less digits than its factorization.

21221440412434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610720206219.

The product of its (nonzero) digits is 49152, while the sum is 34.

Adding to 21221440412434 its reverse (43421404412212), we get a palindrome (64642844824646).

The spelling of 21221440412434 in words is "twenty-one trillion, two hundred twenty-one billion, four hundred forty million, four hundred twelve thousand, four hundred thirty-four".