21621211333354 has 4 divisors (see below), whose sum is σ = 32431817000034. Its totient is φ = 10810605666676.

The previous prime is 21621211333349. The next prime is 21621211333361. The reversal of 21621211333354 is 45333311212612.

It is a happy number.

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., 21609230936329 + 11980397025 = 4648573^2 + 109455^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5405302833337 + ... + 5405302833340.

Almost surely, 2^{21621211333354} is an apocalyptic number.

21621211333354 is a deficient number, since it is larger than the sum of its proper divisors (10810605666680).

21621211333354 is a wasteful number, since it uses less digits than its factorization.

21621211333354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10810605666679.

The product of its digits is 77760, while the sum is 37.

Adding to 21621211333354 its reverse (45333311212612), we get a palindrome (66954522545966).

The spelling of 21621211333354 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred eleven million, three hundred thirty-three thousand, three hundred fifty-four".