21354242016 has 24 divisors (see below), whose sum is σ = 56054885544. Its totient is φ = 7118080640.

The previous prime is 21354241973. The next prime is 21354242023. The reversal of 21354242016 is 61024245312.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111219915 + ... + 111220106.

It is an arithmetic number, because the mean of its divisors is an integer number (2335620231).

Almost surely, 2^21354242016 is an apocalyptic number.

It is an amenable number.

21354242016 is an abundant number, since it is smaller than the sum of its proper divisors (34700643528).

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

21354242016 is a wasteful number, since it uses less digits than its factorization.

21354242016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222440034 (or 222440026 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 21354242016 its reverse (61024245312), we get a palindrome (82378487328).

The spelling of 21354242016 in words is "twenty-one billion, three hundred fifty-four million, two hundred forty-two thousand, sixteen".