21602701 has 4 divisors (see below), whose sum is σ = 21619872. Its totient is φ = 21585532.

The previous prime is 21602689. The next prime is 21602719. The reversal of 21602701 is 10720612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21602701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21602731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6535 + ... + 9268.

It is an arithmetic number, because the mean of its divisors is an integer number (5404968).

Almost surely, 2^21602701 is an apocalyptic number.

It is an amenable number.

21602701 is a deficient number, since it is larger than the sum of its proper divisors (17171).

21602701 is a wasteful number, since it uses less digits than its factorization.

21602701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17170.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 21602701 is about 4647.8705876993. The cubic root of 21602701 is about 278.5069378028.

The spelling of 21602701 in words is "twenty-one million, six hundred two thousand, seven hundred one".