21152520052001 has 8 divisors (see below), whose sum is σ = 22779676328640. Its totient is φ = 19525369396752.

The previous prime is 21152520051997. The next prime is 21152520052009. The reversal of 21152520052001 is 10025002525112.

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 21152520052001 - 2² = 21152520051997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21152520052009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9604436 + ... + 11599578.

It is an arithmetic number, because the mean of its divisors is an integer number (2847459541080).

Almost surely, 2^{21152520052001} is an apocalyptic number.

It is an amenable number.

21152520052001 is a deficient number, since it is larger than the sum of its proper divisors (1627156276639).

21152520052001 is a wasteful number, since it uses less digits than its factorization.

21152520052001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810695.

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 21152520052001 its reverse (10025002525112), we get a palindrome (31177522577113).

The spelling of 21152520052001 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred twenty million, fifty-two thousand, one".