21873855837812 has 24 divisors (see below), whose sum is σ = 41782547792160. Its totient is φ = 9937097824160.

The previous prime is 21873855837767. The next prime is 21873855837839.

21873855837812 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21873855837812² (a number of 27 digits) contains 22 as substring.

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, 139018487 + ... + 139175742.

It is an arithmetic number, because the mean of its divisors is an integer number (1740939491340).

Almost surely, 2^{21873855837812} is an apocalyptic number.

21873855837812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21873855837812 is a deficient number, since it is larger than the sum of its proper divisors (19908691954348).

21873855837812 is a wasteful number, since it uses less digits than its factorization.

21873855837812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278196031 (or 278196029 counting only the distinct ones).

The product of its digits is 180633600, while the sum is 68.

The spelling of 21873855837812 in words is "twenty-one trillion, eight hundred seventy-three billion, eight hundred fifty-five million, eight hundred thirty-seven thousand, eight hundred twelve".