21406161474 has 24 divisors (see below), whose sum is σ = 46451068092. Its totient is φ = 7124456160.

The previous prime is 21406161461. The next prime is 21406161521. The reversal of 21406161474 is 47416160412.

It is a happy number.

21406161474 is a `hidden beast` number, since 21 + 4 + 0 + 6 + 161 + 474 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17439051249 + 3967110225 = 132057^2 + 62985^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 898837 + ... + 922344.

Almost surely, 2^21406161474 is an apocalyptic number.

21406161474 is an abundant number, since it is smaller than the sum of its proper divisors (25044906618).

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

21406161474 is a wasteful number, since it uses less digits than its factorization.

21406161474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821842 (or 1821839 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 21406161474 in words is "twenty-one billion, four hundred six million, one hundred sixty-one thousand, four hundred seventy-four".