21152526655501 has 8 divisors (see below), whose sum is σ = 22557920938560. Its totient is φ = 19765035484608.

The previous prime is 21152526655417. The next prime is 21152526655531. The reversal of 21152526655501 is 10555662525112.

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 21152526655501 - 2⁷ = 21152526655373 is a prime.

It is a super-2 number, since 2×21152526655501² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152526655531) 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, 4475775601 + ... + 4475780326.

It is an arithmetic number, because the mean of its divisors is an integer number (2819740117320).

Almost surely, 2^{21152526655501} is an apocalyptic number.

It is an amenable number.

21152526655501 is a deficient number, since it is larger than the sum of its proper divisors (1405394283059).

21152526655501 is a wasteful number, since it uses less digits than its factorization.

21152526655501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8951556083.

The product of its (nonzero) digits is 900000, while the sum is 46.

The spelling of 21152526655501 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred twenty-six million, six hundred fifty-five thousand, five hundred one".