21121022 has 8 divisors (see below), whose sum is σ = 34118616. Its totient is φ = 9748152.

The previous prime is 21121003. The next prime is 21121033. The reversal of 21121022 is 22012112.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21120994 and 21121012.

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, 406148 + ... + 406199.

It is an arithmetic number, because the mean of its divisors is an integer number (4264827).

Almost surely, 2^21121022 is an apocalyptic number.

21121022 is a deficient number, since it is larger than the sum of its proper divisors (12997594).

21121022 is a wasteful number, since it uses less digits than its factorization.

21121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812362.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21121022 is about 4595.7613079880. The cubic root of 21121022 is about 276.4213877476.

Adding to 21121022 its reverse (22012112), we get a palindrome (43133134).

The spelling of 21121022 in words is "twenty-one million, one hundred twenty-one thousand, twenty-two".