21004151423 has 8 divisors (see below), whose sum is σ = 22254319728. Its totient is φ = 19755608704.

The previous prime is 21004151393. The next prime is 21004151431. The reversal of 21004151423 is 32415140012.

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 21004151423 - 2¹⁶ = 21004085887 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 (21004151723) 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, 379736 + ... + 431517.

It is an arithmetic number, because the mean of its divisors is an integer number (2781789966).

Almost surely, 2^21004151423 is an apocalyptic number.

21004151423 is a deficient number, since it is larger than the sum of its proper divisors (1250168305).

21004151423 is a wasteful number, since it uses less digits than its factorization.

21004151423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812793.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21004151423 its reverse (32415140012), we get a palindrome (53419291435).

The spelling of 21004151423 in words is "twenty-one billion, four million, one hundred fifty-one thousand, four hundred twenty-three".