21221422154252 has 12 divisors (see below), whose sum is σ = 37137741054456. Its totient is φ = 10610638995840.

The previous prime is 21221422154209. The next prime is 21221422154263. The reversal of 21221422154252 is 25245122412212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17355173 + ... + 18537660.

It is an arithmetic number, because the mean of its divisors is an integer number (3094811754538).

Almost surely, 2^{21221422154252} is an apocalyptic number.

It is an amenable number.

21221422154252 is a deficient number, since it is larger than the sum of its proper divisors (15916318900204).

21221422154252 is a wasteful number, since it uses less digits than its factorization.

21221422154252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36040648 (or 36040646 counting only the distinct ones).

The product of its digits is 51200, while the sum is 35.

Adding to 21221422154252 its reverse (25245122412212), we get a palindrome (46466544566464).

The spelling of 21221422154252 in words is "twenty-one trillion, two hundred twenty-one billion, four hundred twenty-two million, one hundred fifty-four thousand, two hundred fifty-two".