21820702 has 16 divisors (see below), whose sum is σ = 35643600. Its totient is φ = 9979200.

The previous prime is 21820699. The next prime is 21820703. The reversal of 21820702 is 20702812.

It is a super-2 number, since 2×21820702² = 952286071545608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21820703) 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, 8799 + ... + 11002.

It is an arithmetic number, because the mean of its divisors is an integer number (2227725).

Almost surely, 2^21820702 is an apocalyptic number.

21820702 is a deficient number, since it is larger than the sum of its proper divisors (13822898).

21820702 is a wasteful number, since it uses less digits than its factorization.

21820702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19851.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 21820702 is about 4671.2634265261. The cubic root of 21820702 is about 279.4406435208.

It can be divided in two parts, 21820 and 702, that added together give a palindrome (22522).

The spelling of 21820702 in words is "twenty-one million, eight hundred twenty thousand, seven hundred two".