21211702 has 12 divisors (see below), whose sum is σ = 32955156. Its totient is φ = 10239320.

The previous prime is 21211643. The next prime is 21211709. The reversal of 21211702 is 20711212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4624 + ... + 7987.

It is an arithmetic number, because the mean of its divisors is an integer number (2746263).

Almost surely, 2^21211702 is an apocalyptic number.

21211702 is a deficient number, since it is larger than the sum of its proper divisors (11743454).

21211702 is a wasteful number, since it uses less digits than its factorization.

21211702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12671 (or 12642 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 21211702 is about 4605.6163539748. The cubic root of 21211702 is about 276.8164144737.

Adding to 21211702 its reverse (20711212), we get a palindrome (41922914).

The spelling of 21211702 in words is "twenty-one million, two hundred eleven thousand, seven hundred two".