21423424615747 has 8 divisors (see below), whose sum is σ = 26709724196352. Its totient is φ = 16693577622600.

The previous prime is 21423424615661. The next prime is 21423424615771. The reversal of 21423424615747 is 74751642432412.

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 21423424615747 - 2³⁹ = 20873668801859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21423424615694 and 21423424615703.

It is not an unprimeable number, because it can be changed into a prime (21423424615147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139113146779 + ... + 139113146932.

It is an arithmetic number, because the mean of its divisors is an integer number (3338715524544).

Almost surely, 2^{21423424615747} is an apocalyptic number.

21423424615747 is a deficient number, since it is larger than the sum of its proper divisors (5286299580605).

21423424615747 is a wasteful number, since it uses less digits than its factorization.

21423424615747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278226293729.

The product of its digits is 9031680, while the sum is 52.

The spelling of 21423424615747 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred twenty-four million, six hundred fifteen thousand, seven hundred forty-seven".