21212184741 has 32 divisors (see below), whose sum is σ = 32679946368. Its totient is φ = 12095600640.

The previous prime is 21212184733. The next prime is 21212184797. The reversal of 21212184741 is 14748121212.

It is not a de Polignac number, because 21212184741 - 2³ = 21212184733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212144741) 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 31 ways as a sum of consecutive naturals, for example, 2732121 + ... + 2739873.

It is an arithmetic number, because the mean of its divisors is an integer number (1021248324).

Almost surely, 2^21212184741 is an apocalyptic number.

It is an amenable number.

21212184741 is a deficient number, since it is larger than the sum of its proper divisors (11467761627).

21212184741 is a wasteful number, since it uses less digits than its factorization.

21212184741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12661.

The product of its digits is 7168, while the sum is 33.

The spelling of 21212184741 in words is "twenty-one billion, two hundred twelve million, one hundred eighty-four thousand, seven hundred forty-one".