21100340244 has 24 divisors (see below), whose sum is σ = 49238326368. Its totient is φ = 7032846880.

The previous prime is 21100340221. The next prime is 21100340269. The reversal of 21100340244 is 44204300112.

It is a self number, because there is not a number n which added to its sum of digits gives 21100340244.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85279 + ... + 222425.

It is an arithmetic number, because the mean of its divisors is an integer number (2051596932).

Almost surely, 2^21100340244 is an apocalyptic number.

It is an amenable number.

21100340244 is an abundant number, since it is smaller than the sum of its proper divisors (28137986124).

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

21100340244 is a wasteful number, since it uses less digits than its factorization.

21100340244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149975 (or 149973 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21100340244 its reverse (44204300112), we get a palindrome (65304640356).

The spelling of 21100340244 in words is "twenty-one billion, one hundred million, three hundred forty thousand, two hundred forty-four".