21210143241505 has 16 divisors (see below), whose sum is σ = 26674765332480. Its totient is φ = 16159495480128.

The previous prime is 21210143241499. The next prime is 21210143241523. The reversal of 21210143241505 is 50514234101212.

It is a cyclic number.

It is not a de Polignac number, because 21210143241505 - 2¹⁷ = 21210143110433 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 402672417 + ... + 402725086.

It is an arithmetic number, because the mean of its divisors is an integer number (1667172833280).

Almost surely, 2^{21210143241505} is an apocalyptic number.

It is an amenable number.

21210143241505 is a deficient number, since it is larger than the sum of its proper divisors (5464622090975).

21210143241505 is a wasteful number, since it uses less digits than its factorization.

21210143241505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805397760.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 21210143241505 its reverse (50514234101212), we get a palindrome (71724377342717).

The spelling of 21210143241505 in words is "twenty-one trillion, two hundred ten billion, one hundred forty-three million, two hundred forty-one thousand, five hundred five".