21950271 has 20 divisors (see below), whose sum is σ = 37475152. Its totient is φ = 12542688.

The previous prime is 21950267. The next prime is 21950273. The reversal of 21950271 is 17205912.

It is not a de Polignac number, because 21950271 - 2² = 21950267 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21950273) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18790 + ... + 19923.

Almost surely, 2^21950271 is an apocalyptic number.

21950271 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21950271 is a deficient number, since it is larger than the sum of its proper divisors (15524881).

21950271 is an equidigital number, since it uses as much as digits as its factorization.

21950271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38732 (or 38723 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 21950271 is about 4685.1116315409. Note that the first 3 decimals coincide. The cubic root of 21950271 is about 279.9926486165.

The spelling of 21950271 in words is "twenty-one million, nine hundred fifty thousand, two hundred seventy-one".