21221405524052 has 24 divisors (see below), whose sum is σ = 37226772274272. Its totient is φ = 10585186365600.

The previous prime is 21221405524037. The next prime is 21221405524061. The reversal of 21221405524052 is 25042550412212.

It is a happy number.

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, 63223427 + ... + 63558197.

It is an arithmetic number, because the mean of its divisors is an integer number (1551115511428).

Almost surely, 2^{21221405524052} is an apocalyptic number.

It is an amenable number.

21221405524052 is a deficient number, since it is larger than the sum of its proper divisors (16005366750220).

21221405524052 is a wasteful number, since it uses less digits than its factorization.

21221405524052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372839 (or 372837 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 35.

Adding to 21221405524052 its reverse (25042550412212), we get a palindrome (46263955936264).

The spelling of 21221405524052 in words is "twenty-one trillion, two hundred twenty-one billion, four hundred five million, five hundred twenty-four thousand, fifty-two".