21350201505 has 16 divisors (see below), whose sum is σ = 35338265280. Its totient is φ = 10994126528.

The previous prime is 21350201503. The next prime is 21350201597. The reversal of 21350201505 is 50510205312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21350201505 - 2¹ = 21350201503 is a prime.

It is a super-2 number, since 2×21350201505² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21350201503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24540027 + ... + 24540896.

It is an arithmetic number, because the mean of its divisors is an integer number (2208641580).

Almost surely, 2^21350201505 is an apocalyptic number.

It is an amenable number.

21350201505 is a deficient number, since it is larger than the sum of its proper divisors (13988063775).

21350201505 is a wasteful number, since it uses less digits than its factorization.

21350201505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49080960.

The product of its (nonzero) digits is 1500, while the sum is 24.

Adding to 21350201505 its reverse (50510205312), we get a palindrome (71860406817).

The spelling of 21350201505 in words is "twenty-one billion, three hundred fifty million, two hundred one thousand, five hundred five".