21918200742 has 48 divisors (see below), whose sum is σ = 51509373552. Its totient is φ = 6708579840.

The previous prime is 21918200729. The next prime is 21918200753. The reversal of 21918200742 is 24700281912.

It is a junction number, because it is equal to n+sod(n) for n = 21918200697 and 21918200706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 860968 + ... + 886059.

It is an arithmetic number, because the mean of its divisors is an integer number (1073111949).

Almost surely, 2^21918200742 is an apocalyptic number.

21918200742 is an abundant number, since it is smaller than the sum of its proper divisors (29591172810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21918200742 is a wasteful number, since it uses less digits than its factorization.

21918200742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747093 (or 1747090 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The spelling of 21918200742 in words is "twenty-one billion, nine hundred eighteen million, two hundred thousand, seven hundred forty-two".