21221364145641 has 32 divisors (see below), whose sum is σ = 30933410112000. Its totient is φ = 12833951625600.

The previous prime is 21221364145627. The next prime is 21221364145649. The reversal of 21221364145641 is 14654146312212.

It is not a de Polignac number, because 21221364145641 - 2⁹ = 21221364145129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221364145593 and 21221364145602.

It is not an unprimeable number, because it can be changed into a prime (21221364145649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129727621 + ... + 129891101.

It is an arithmetic number, because the mean of its divisors is an integer number (966669066000).

Almost surely, 2^{21221364145641} is an apocalyptic number.

It is an amenable number.

21221364145641 is a deficient number, since it is larger than the sum of its proper divisors (9712045966359).

21221364145641 is a wasteful number, since it uses less digits than its factorization.

21221364145641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171877.

The product of its digits is 276480, while the sum is 42.

The spelling of 21221364145641 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred sixty-four million, one hundred forty-five thousand, six hundred forty-one".