21242515050203 has 8 divisors (see below), whose sum is σ = 21254289638400. Its totient is φ = 21230740915560.

The previous prime is 21242515050187. The next prime is 21242515050313. The reversal of 21242515050203 is 30205051524212.

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 21242515050203 - 2⁴ = 21242515050187 is a prime.

It is a super-2 number, since 2×21242515050203² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21242515050203.

It is not an unprimeable number, because it can be changed into a prime (21242515050103) 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, 143070398 + ... + 143218796.

It is an arithmetic number, because the mean of its divisors is an integer number (2656786204800).

Almost surely, 2^{21242515050203} is an apocalyptic number.

21242515050203 is a deficient number, since it is larger than the sum of its proper divisors (11774588197).

21242515050203 is a wasteful number, since it uses less digits than its factorization.

21242515050203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226777.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 21242515050203 its reverse (30205051524212), we get a palindrome (51447566574415).

The spelling of 21242515050203 in words is "twenty-one trillion, two hundred forty-two billion, five hundred fifteen million, fifty thousand, two hundred three".