21074641 has 8 divisors (see below), whose sum is σ = 24192320. Its totient is φ = 17983728.

The previous prime is 21074639. The next prime is 21074657. The reversal of 21074641 is 14647012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21074641 - 2¹ = 21074639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21074681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4971 + ... + 8176.

It is an arithmetic number, because the mean of its divisors is an integer number (3024040).

Almost surely, 2^21074641 is an apocalyptic number.

It is an amenable number.

21074641 is a deficient number, since it is larger than the sum of its proper divisors (3117679).

21074641 is a wasteful number, since it uses less digits than its factorization.

21074641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13383.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21074641 is about 4590.7124719372. The cubic root of 21074641 is about 276.2189023368.

The spelling of 21074641 in words is "twenty-one million, seventy-four thousand, six hundred forty-one".