21471950 has 24 divisors (see below), whose sum is σ = 40792032. Its totient is φ = 8405120.

The previous prime is 21471941. The next prime is 21471953. The reversal of 21471950 is 5917412.

It is a super-2 number, since 2×21471950² = 922089273605000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21471953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2219 + ... + 6918.

It is an arithmetic number, because the mean of its divisors is an integer number (1699668).

Almost surely, 2^21471950 is an apocalyptic number.

21471950 is a deficient number, since it is larger than the sum of its proper divisors (19320082).

21471950 is a wasteful number, since it uses less digits than its factorization.

21471950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9196 (or 9191 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 21471950 is about 4633.7835512678. The cubic root of 21471950 is about 277.9439098059.

The spelling of 21471950 in words is "twenty-one million, four hundred seventy-one thousand, nine hundred fifty".