21903919197354 has 12 divisors (see below), whose sum is σ = 47458491594306. Its totient is φ = 7301306399112.

The previous prime is 21903919197353. The next prime is 21903919197421. The reversal of 21903919197354 is 45379191930912.

21903919197354 is a `hidden beast` number, since 2 + 1 + 9 + 0 + 3 + 9 + 191 + 97 + 354 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21900743311329 + 3175886025 = 4679823^2 + 56355^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21903919197291 and 21903919197300.

It is not an unprimeable number, because it can be changed into a prime (21903919197353) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 608442199909 + ... + 608442199944.

Almost surely, 2^{21903919197354} is an apocalyptic number.

21903919197354 is an abundant number, since it is smaller than the sum of its proper divisors (25554572396952).

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

21903919197354 is a wasteful number, since it uses less digits than its factorization.

21903919197354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216884399861 (or 1216884399858 counting only the distinct ones).

The product of its (nonzero) digits is 16533720, while the sum is 63.

The spelling of 21903919197354 in words is "twenty-one trillion, nine hundred three billion, nine hundred nineteen million, one hundred ninety-seven thousand, three hundred fifty-four".