21542941923 has 8 divisors (see below), whose sum is σ = 28725547536. Its totient is φ = 14361148800.

The previous prime is 21542941919. The next prime is 21542941939. The reversal of 21542941923 is 32914924512.

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

It is not a de Polignac number, because 21542941923 - 2² = 21542941919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21542941913) 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, 138298 + ... + 249423.

It is an arithmetic number, because the mean of its divisors is an integer number (3590693442).

Almost surely, 2^21542941923 is an apocalyptic number.

21542941923 is a deficient number, since it is larger than the sum of its proper divisors (7182605613).

21542941923 is a wasteful number, since it uses less digits than its factorization.

21542941923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406245.

The product of its digits is 155520, while the sum is 42.

The spelling of 21542941923 in words is "twenty-one billion, five hundred forty-two million, nine hundred forty-one thousand, nine hundred twenty-three".