21790701 has 20 divisors (see below), whose sum is σ = 34267200. Its totient is φ = 13761576.

The previous prime is 21790697. The next prime is 21790711. The reversal of 21790701 is 10709712.

It is not a de Polignac number, because 21790701 - 2² = 21790697 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21790711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5541 + ... + 8618.

It is an arithmetic number, because the mean of its divisors is an integer number (1713360).

Almost surely, 2^21790701 is an apocalyptic number.

It is an amenable number.

21790701 is a deficient number, since it is larger than the sum of its proper divisors (12476499).

21790701 is a wasteful number, since it uses less digits than its factorization.

21790701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14190 (or 14181 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 21790701 is about 4668.0510922654. The cubic root of 21790701 is about 279.3125183455.

The spelling of 21790701 in words is "twenty-one million, seven hundred ninety thousand, seven hundred one".