21221524060612 has 6 divisors (see below), whose sum is σ = 37137667106078. Its totient is φ = 10610762030304.

The previous prime is 21221524060537. The next prime is 21221524060621. The reversal of 21221524060612 is 21606042512212.

It can be written as a sum of positive squares in only one way, i.e., 20691272122756 + 530251937856 = 4548766^2 + 728184^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2652690507573 + ... + 2652690507580.

Almost surely, 2^{21221524060612} is an apocalyptic number.

It is an amenable number.

21221524060612 is a deficient number, since it is larger than the sum of its proper divisors (15916143045466).

21221524060612 is a wasteful number, since it uses less digits than its factorization.

21221524060612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305381015157 (or 5305381015155 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

Adding to 21221524060612 its reverse (21606042512212), we get a palindrome (42827566572824).

The spelling of 21221524060612 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred twenty-four million, sixty thousand, six hundred twelve".