21424804620887 has 8 divisors (see below), whose sum is σ = 21588621541872. Its totient is φ = 21260991772800.

The previous prime is 21424804620881. The next prime is 21424804620911. The reversal of 21424804620887 is 78802640842412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21424804620887 - 2⁴ = 21424804620871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424804620881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9996413 + ... + 11948969.

It is an arithmetic number, because the mean of its divisors is an integer number (2698577692734).

Almost surely, 2^{21424804620887} is an apocalyptic number.

21424804620887 is a deficient number, since it is larger than the sum of its proper divisors (163816920985).

21424804620887 is a wasteful number, since it uses less digits than its factorization.

21424804620887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036449.

The product of its (nonzero) digits is 11010048, while the sum is 56.

The spelling of 21424804620887 in words is "twenty-one trillion, four hundred twenty-four billion, eight hundred four million, six hundred twenty thousand, eight hundred eighty-seven".