21221364154105 has 8 divisors (see below), whose sum is σ = 25517927823552. Its totient is φ = 16942230764208.

The previous prime is 21221364154097. The next prime is 21221364154129. The reversal of 21221364154105 is 50145146312212.

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

It is a cyclic number.

It is not a de Polignac number, because 21221364154105 - 2³ = 21221364154097 is a prime.

It is a super-2 number, since 2×21221364154105² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4357567207 + ... + 4357572076.

It is an arithmetic number, because the mean of its divisors is an integer number (3189740977944).

Almost surely, 2^{21221364154105} is an apocalyptic number.

It is an amenable number.

21221364154105 is a deficient number, since it is larger than the sum of its proper divisors (4296563669447).

21221364154105 is an equidigital number, since it uses as much as digits as its factorization.

21221364154105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8715139775.

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 21221364154105 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred sixty-four million, one hundred fifty-four thousand, one hundred five".