21151145423 has 8 divisors (see below), whose sum is σ = 21735398688. Its totient is φ = 20567555424.

The previous prime is 21151145419. The next prime is 21151145443. The reversal of 21151145423 is 32454115112.

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 21151145423 - 2² = 21151145419 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 (21151145443) 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, 100811 + ... + 229052.

It is an arithmetic number, because the mean of its divisors is an integer number (2716924836).

Almost surely, 2^21151145423 is an apocalyptic number.

21151145423 is a deficient number, since it is larger than the sum of its proper divisors (584253265).

21151145423 is a wasteful number, since it uses less digits than its factorization.

21151145423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331633.

The product of its digits is 4800, while the sum is 29.

The spelling of 21151145423 in words is "twenty-one billion, one hundred fifty-one million, one hundred forty-five thousand, four hundred twenty-three".