21142104213 has 32 divisors (see below), whose sum is σ = 31712394240. Its totient is φ = 12449928960.

The previous prime is 21142104211. The next prime is 21142104257. The reversal of 21142104213 is 31240124112.

It is not a de Polignac number, because 21142104213 - 2¹ = 21142104211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21142104213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142104211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1728 + ... + 205638.

It is an arithmetic number, because the mean of its divisors is an integer number (991012320).

Almost surely, 2^21142104213 is an apocalyptic number.

It is an amenable number.

21142104213 is a deficient number, since it is larger than the sum of its proper divisors (10570290027).

21142104213 is a wasteful number, since it uses less digits than its factorization.

21142104213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204057.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21142104213 its reverse (31240124112), we get a palindrome (52382228325).

The spelling of 21142104213 in words is "twenty-one billion, one hundred forty-two million, one hundred four thousand, two hundred thirteen".