21954119163826 has 8 divisors (see below), whose sum is σ = 33098342090220. Its totient is φ = 10921338467088.

The previous prime is 21954119163673. The next prime is 21954119163827. The reversal of 21954119163826 is 62836191145912.

It can be written as a sum of positive squares in 2 ways, for example, as 21844415787601 + 109703376225 = 4673801^2 + 331215^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 27860556921 + ... + 27860557708.

Almost surely, 2^{21954119163826} is an apocalyptic number.

21954119163826 is a deficient number, since it is larger than the sum of its proper divisors (11144222926394).

21954119163826 is a wasteful number, since it uses less digits than its factorization.

21954119163826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55721114828.

The product of its digits is 5598720, while the sum is 58.

The spelling of 21954119163826 in words is "twenty-one trillion, nine hundred fifty-four billion, one hundred nineteen million, one hundred sixty-three thousand, eight hundred twenty-six".