21147126423 has 8 divisors (see below), whose sum is σ = 28202702208. Its totient is φ = 14094817464.

The previous prime is 21147126397. The next prime is 21147126479. The reversal of 21147126423 is 32462174112.

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

It is not a de Polignac number, because 21147126423 - 2⁶ = 21147126359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21147026423) 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, 801561 + ... + 827522.

It is an arithmetic number, because the mean of its divisors is an integer number (3525337776).

Almost surely, 2^21147126423 is an apocalyptic number.

21147126423 is a deficient number, since it is larger than the sum of its proper divisors (7055575785).

21147126423 is a wasteful number, since it uses less digits than its factorization.

21147126423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633413.

The product of its digits is 16128, while the sum is 33.

The spelling of 21147126423 in words is "twenty-one billion, one hundred forty-seven million, one hundred twenty-six thousand, four hundred twenty-three".