21021022 has 8 divisors (see below), whose sum is σ = 34398072. Its totient is φ = 9555000.

The previous prime is 21021001. The next prime is 21021043. The reversal of 21021022 is 22012012.

It is an interprime number because it is at equal distance from previous prime (21021001) and next prime (21021043).

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

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, 477729 + ... + 477772.

It is an arithmetic number, because the mean of its divisors is an integer number (4299759).

Almost surely, 2^21021022 is an apocalyptic number.

21021022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21021022 is a deficient number, since it is larger than the sum of its proper divisors (13377050).

21021022 is a wasteful number, since it uses less digits than its factorization.

21021022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955514.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21021022 is about 4584.8688094645. The cubic root of 21021022 is about 275.9844474188.

Adding to 21021022 its reverse (22012012), we get a palindrome (43033034).

The spelling of 21021022 in words is "twenty-one million, twenty-one thousand, twenty-two".