21124999994 has 8 divisors (see below), whose sum is σ = 36214285728. Its totient is φ = 9053571420.

The previous prime is 21124999993. The next prime is 21124999999. The reversal of 21124999994 is 49999942112.

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

It is not an unprimeable number, because it can be changed into a prime (21124999991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754464272 + ... + 754464299.

It is an arithmetic number, because the mean of its divisors is an integer number (4526785716).

Almost surely, 2^21124999994 is an apocalyptic number.

21124999994 is a deficient number, since it is larger than the sum of its proper divisors (15089285734).

21124999994 is a wasteful number, since it uses less digits than its factorization.

21124999994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508928580.

The product of its digits is 3779136, while the sum is 59.

The spelling of 21124999994 in words is "twenty-one billion, one hundred twenty-four million, nine hundred ninety-nine thousand, nine hundred ninety-four".