21221341222155 has 8 divisors (see below), whose sum is σ = 33954145955472. Its totient is φ = 11318048651808.

The previous prime is 21221341222099. The next prime is 21221341222171. The reversal of 21221341222155 is 55122214312212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21221341222155 - 2¹⁸ = 21221340960011 is a prime.

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, 707378040724 + ... + 707378040753.

It is an arithmetic number, because the mean of its divisors is an integer number (4244268244434).

Almost surely, 2^{21221341222155} is an apocalyptic number.

21221341222155 is a deficient number, since it is larger than the sum of its proper divisors (12732804733317).

21221341222155 is a wasteful number, since it uses less digits than its factorization.

21221341222155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414756081485.

The product of its digits is 19200, while the sum is 33.

Adding to 21221341222155 its reverse (55122214312212), we get a palindrome (76343555534367).

The spelling of 21221341222155 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred forty-one million, two hundred twenty-two thousand, one hundred fifty-five".