21437452642854 has 32 divisors (see below), whose sum is σ = 44355112431840. Its totient is φ = 6899135936000.

The previous prime is 21437452642831. The next prime is 21437452642889. The reversal of 21437452642854 is 45824625473412.

It is a junction number, because it is equal to n+sod(n) for n = 21437452642794 and 21437452642803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1967614 + ... + 6837134.

It is an arithmetic number, because the mean of its divisors is an integer number (1386097263495).

Almost surely, 2^{21437452642854} is an apocalyptic number.

21437452642854 is an abundant number, since it is smaller than the sum of its proper divisors (22917659788986).

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

21437452642854 is a wasteful number, since it uses less digits than its factorization.

21437452642854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4894856.

The product of its digits is 51609600, while the sum is 57.

The spelling of 21437452642854 in words is "twenty-one trillion, four hundred thirty-seven billion, four hundred fifty-two million, six hundred forty-two thousand, eight hundred fifty-four".