21354204024 has 48 divisors (see below), whose sum is σ = 57846035520. Its totient is φ = 7116624000.

The previous prime is 21354204023. The next prime is 21354204031. The reversal of 21354204024 is 42040245312.

21354204024 is a `hidden beast` number, since 213 + 5 + 42 + 0 + 402 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354204023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 362649 + ... + 417399.

It is an arithmetic number, because the mean of its divisors is an integer number (1205125740).

Almost surely, 2^21354204024 is an apocalyptic number.

21354204024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21354204024 is an abundant number, since it is smaller than the sum of its proper divisors (36491831496).

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

21354204024 is a wasteful number, since it uses less digits than its factorization.

21354204024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60180 (or 60173 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 21354204024 its reverse (42040245312), we get a palindrome (63394449336).

The spelling of 21354204024 in words is "twenty-one billion, three hundred fifty-four million, two hundred four thousand, twenty-four".