21002222 has 8 divisors (see below), whose sum is σ = 31973736. Its totient is φ = 10344312.

The previous prime is 21002213. The next prime is 21002231. The reversal of 21002222 is 22220012.

It is an interprime number because it is at equal distance from previous prime (21002213) and next prime (21002231).

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

21002222 is a modest number, since divided by 2222 gives 2100 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78233 + ... + 78500.

It is an arithmetic number, because the mean of its divisors is an integer number (3996717).

Almost surely, 2^21002222 is an apocalyptic number.

21002222 is a deficient number, since it is larger than the sum of its proper divisors (10971514).

21002222 is a wasteful number, since it uses less digits than its factorization.

21002222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156802.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 21002222 is about 4582.8181286191. The cubic root of 21002222 is about 275.9021479767.

Adding to 21002222 its reverse (22220012), we get a palindrome (43222234).

The spelling of 21002222 in words is "twenty-one million, two thousand, two hundred twenty-two".