21873257012 has 6 divisors (see below), whose sum is σ = 38278199778. Its totient is φ = 10936628504.

The previous prime is 21873256991. The next prime is 21873257017. The reversal of 21873257012 is 21075237812.

It can be written as a sum of positive squares in only one way, i.e., 18680328976 + 3192928036 = 136676^2 + 56506^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21873257017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2734157123 + ... + 2734157130.

It is an arithmetic number, because the mean of its divisors is an integer number (6379699963).

Almost surely, 2^21873257012 is an apocalyptic number.

It is an amenable number.

21873257012 is a deficient number, since it is larger than the sum of its proper divisors (16404942766).

21873257012 is a wasteful number, since it uses less digits than its factorization.

21873257012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5468314257 (or 5468314255 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 38.

The spelling of 21873257012 in words is "twenty-one billion, eight hundred seventy-three million, two hundred fifty-seven thousand, twelve".