21070641 has 8 divisors (see below), whose sum is σ = 28135744. Its totient is φ = 14026320.

The previous prime is 21070613. The next prime is 21070657. The reversal of 21070641 is 14607012.

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

It is not a de Polignac number, because 21070641 - 2⁷ = 21070513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21070541) 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, 2650 + ... + 7011.

It is an arithmetic number, because the mean of its divisors is an integer number (3516968).

Almost surely, 2^21070641 is an apocalyptic number.

It is an amenable number.

21070641 is a deficient number, since it is larger than the sum of its proper divisors (7065103).

21070641 is an equidigital number, since it uses as much as digits as its factorization.

21070641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10391.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21070641 is about 4590.2767890401. The cubic root of 21070641 is about 276.2014256370.

Adding to 21070641 its reverse (14607012), we get a palindrome (35677653).

The spelling of 21070641 in words is "twenty-one million, seventy thousand, six hundred forty-one".