21220440434504 has 16 divisors (see below), whose sum is σ = 39788391566700. Its totient is φ = 10610202683392.

The previous prime is 21220440434443. The next prime is 21220440434521. The reversal of 21220440434504 is 40543404402212.

It can be written as a sum of positive squares in 2 ways, for example, as 15245104632004 + 5975335802500 = 3904498^2 + 2444450^2 .

It is a super-3 number, since 3×21220440434504³ (a number of 41 digits) contains 333 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 3971252 + ... + 7629660.

Almost surely, 2^{21220440434504} is an apocalyptic number.

It is an amenable number.

21220440434504 is a deficient number, since it is larger than the sum of its proper divisors (18567951132196).

21220440434504 is a wasteful number, since it uses less digits than its factorization.

21220440434504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4383472 (or 4383468 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 35.

Adding to 21220440434504 its reverse (40543404402212), we get a palindrome (61763844836716).

The spelling of 21220440434504 in words is "twenty-one trillion, two hundred twenty billion, four hundred forty million, four hundred thirty-four thousand, five hundred four".