21954119163828 has 12 divisors (see below), whose sum is σ = 51226278048960. Its totient is φ = 7318039721272.

The previous prime is 21954119163827. The next prime is 21954119163863. The reversal of 21954119163828 is 82836191145912.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21954119163828² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21954119163827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914754965148 + ... + 914754965171.

It is an arithmetic number, because the mean of its divisors is an integer number (4268856504080).

Almost surely, 2^{21954119163828} is an apocalyptic number.

It is an amenable number.

21954119163828 is an abundant number, since it is smaller than the sum of its proper divisors (29272158885132).

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

21954119163828 is a wasteful number, since it uses less digits than its factorization.

21954119163828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829509930326 (or 1829509930324 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 60.

The spelling of 21954119163828 in words is "twenty-one trillion, nine hundred fifty-four billion, one hundred nineteen million, one hundred sixty-three thousand, eight hundred twenty-eight".