21424804621542 has 48 divisors (see below), whose sum is σ = 53456873513472. Its totient is φ = 6074644708080.

The previous prime is 21424804621513. The next prime is 21424804621559. The reversal of 21424804621542 is 24512640842412.

21424804621542 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 4 + 80 + 4 + 6 + 21 + 542 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 648983998 + ... + 649017009.

It is an arithmetic number, because the mean of its divisors is an integer number (1113684864864).

Almost surely, 2^{21424804621542} is an apocalyptic number.

21424804621542 is an abundant number, since it is smaller than the sum of its proper divisors (32032068891930).

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

21424804621542 is a wasteful number, since it uses less digits than its factorization.

21424804621542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298001153 (or 1298001150 counting only the distinct ones).

The product of its (nonzero) digits is 983040, while the sum is 45.

The spelling of 21424804621542 in words is "twenty-one trillion, four hundred twenty-four billion, eight hundred four million, six hundred twenty-one thousand, five hundred forty-two".