21502002201 has 8 divisors (see below), whose sum is σ = 28671618240. Its totient is φ = 14333527152.

The previous prime is 21502002191. The next prime is 21502002229. The reversal of 21502002201 is 10220020512.

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

It is not a de Polignac number, because 21502002201 - 2¹⁷ = 21501871129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21502004201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240261 + ... + 317378.

It is an arithmetic number, because the mean of its divisors is an integer number (3583952280).

Almost surely, 2^21502002201 is an apocalyptic number.

It is an amenable number.

21502002201 is a deficient number, since it is larger than the sum of its proper divisors (7169616039).

21502002201 is a wasteful number, since it uses less digits than its factorization.

21502002201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570495.

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 21502002201 its reverse (10220020512), we get a palindrome (31722022713).

The spelling of 21502002201 in words is "twenty-one billion, five hundred two million, two thousand, two hundred one".