21221354363105 has 32 divisors (see below), whose sum is σ = 27533968809984. Its totient is φ = 15608724189696.

The previous prime is 21221354363101. The next prime is 21221354363123. The reversal of 21221354363105 is 50136345312212.

It is a cyclic number.

It is not a de Polignac number, because 21221354363105 - 2² = 21221354363101 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21221354363101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17512397 + ... + 18684933.

It is an arithmetic number, because the mean of its divisors is an integer number (860436525312).

Almost surely, 2^{21221354363105} is an apocalyptic number.

It is an amenable number.

21221354363105 is a deficient number, since it is larger than the sum of its proper divisors (6312614446879).

21221354363105 is a wasteful number, since it uses less digits than its factorization.

21221354363105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173665.

The product of its (nonzero) digits is 129600, while the sum is 38.

Adding to 21221354363105 its reverse (50136345312212), we get a palindrome (71357699675317).

The spelling of 21221354363105 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred fifty-four million, three hundred sixty-three thousand, one hundred five".