21441257155553 has 8 divisors (see below), whose sum is σ = 21476514320448. Its totient is φ = 21406007399184.

The previous prime is 21441257155501. The next prime is 21441257155603. The reversal of 21441257155553 is 35555175214412.

It is a happy number.

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 21441257155553 - 2¹⁰ = 21441257154529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21441257055553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3955850 + ... + 7650572.

It is an arithmetic number, because the mean of its divisors is an integer number (2684564290056).

Almost surely, 2^{21441257155553} is an apocalyptic number.

It is an amenable number.

21441257155553 is a deficient number, since it is larger than the sum of its proper divisors (35257164895).

21441257155553 is an equidigital number, since it uses as much as digits as its factorization.

21441257155553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3704263.

The product of its digits is 4200000, while the sum is 50.

The spelling of 21441257155553 in words is "twenty-one trillion, four hundred forty-one billion, two hundred fifty-seven million, one hundred fifty-five thousand, five hundred fifty-three".