21054361208 has 16 divisors (see below), whose sum is σ = 39478985280. Its totient is φ = 10526631808.

The previous prime is 21054361189. The next prime is 21054361213. The reversal of 21054361208 is 80216345012.

It is a super-2 number, since 2×21054361208² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 127385 + ... + 241527.

It is an arithmetic number, because the mean of its divisors is an integer number (2467436580).

Almost surely, 2^21054361208 is an apocalyptic number.

It is an amenable number.

21054361208 is a deficient number, since it is larger than the sum of its proper divisors (18424624072).

21054361208 is a wasteful number, since it uses less digits than its factorization.

21054361208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137206 (or 137202 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 21054361208 in words is "twenty-one billion, fifty-four million, three hundred sixty-one thousand, two hundred eight".