21386954118 has 32 divisors (see below), whose sum is σ = 44296027776. Its totient is φ = 6879293568.

The previous prime is 21386954089. The next prime is 21386954167. The reversal of 21386954118 is 81145968312.

It is a happy number.

It is a congruent number.

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, 477955 + ... + 520782.

It is an arithmetic number, because the mean of its divisors is an integer number (1384250868).

Almost surely, 2^21386954118 is an apocalyptic number.

21386954118 is an abundant number, since it is smaller than the sum of its proper divisors (22909073658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21386954118 is a wasteful number, since it uses less digits than its factorization.

21386954118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998868.

The product of its digits is 414720, while the sum is 48.

The spelling of 21386954118 in words is "twenty-one billion, three hundred eighty-six million, nine hundred fifty-four thousand, one hundred eighteen".