21850458542 has 12 divisors (see below), whose sum is σ = 36026169648. Its totient is φ = 9932026500.

The previous prime is 21850458529. The next prime is 21850458563. The reversal of 21850458542 is 24585405812.

It is a junction number, because it is equal to n+sod(n) for n = 21850458493 and 21850458502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45145334 + ... + 45145817.

It is an arithmetic number, because the mean of its divisors is an integer number (3002180804).

Almost surely, 2^21850458542 is an apocalyptic number.

21850458542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21850458542 is a deficient number, since it is larger than the sum of its proper divisors (14175711106).

21850458542 is a wasteful number, since it uses less digits than its factorization.

21850458542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90291175 (or 90291164 counting only the distinct ones).

The product of its (nonzero) digits is 512000, while the sum is 44.

The spelling of 21850458542 in words is "twenty-one billion, eight hundred fifty million, four hundred fifty-eight thousand, five hundred forty-two".