21419847 has 12 divisors (see below), whose sum is σ = 32760000. Its totient is φ = 13439808.

The previous prime is 21419843. The next prime is 21419851. The reversal of 21419847 is 74891412.

It is an interprime number because it is at equal distance from previous prime (21419843) and next prime (21419851).

It is not a de Polignac number, because 21419847 - 2² = 21419843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21419843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69847 + ... + 70152.

It is an arithmetic number, because the mean of its divisors is an integer number (2730000).

Almost surely, 2^21419847 is an apocalyptic number.

21419847 is a deficient number, since it is larger than the sum of its proper divisors (11340153).

21419847 is a wasteful number, since it uses less digits than its factorization.

21419847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140022 (or 140019 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 21419847 is about 4628.1580569380. The cubic root of 21419847 is about 277.7189117513.

The spelling of 21419847 in words is "twenty-one million, four hundred nineteen thousand, eight hundred forty-seven".