21490894062 has 48 divisors (see below), whose sum is σ = 51977996928. Its totient is φ = 6360938640.

The previous prime is 21490894049. The next prime is 21490894081. The reversal of 21490894062 is 26049809412.

21490894062 is a `hidden beast` number, since 21 + 490 + 89 + 4 + 0 + 62 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21490893999 and 21490894017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1253578 + ... + 1270605.

It is an arithmetic number, because the mean of its divisors is an integer number (1082874936).

Almost surely, 2^21490894062 is an apocalyptic number.

21490894062 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21490894062 is an abundant number, since it is smaller than the sum of its proper divisors (30487102866).

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

21490894062 is a wasteful number, since it uses less digits than its factorization.

21490894062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2524245 (or 2524242 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 21490894062 in words is "twenty-one billion, four hundred ninety million, eight hundred ninety-four thousand, sixty-two".