21318033954 has 32 divisors (see below), whose sum is σ = 48732456960. Its totient is φ = 6090176592.

The previous prime is 21318033907. The next prime is 21318033959. The reversal of 21318033954 is 45933081312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21318033959) 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 15 ways as a sum of consecutive naturals, for example, 433767 + ... + 480405.

It is an arithmetic number, because the mean of its divisors is an integer number (1522889280).

Almost surely, 2^21318033954 is an apocalyptic number.

21318033954 is an abundant number, since it is smaller than the sum of its proper divisors (27414423006).

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

21318033954 is a wasteful number, since it uses less digits than its factorization.

21318033954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57534.

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 21318033954 in words is "twenty-one billion, three hundred eighteen million, thirty-three thousand, nine hundred fifty-four".