21022010122 has 4 divisors (see below), whose sum is σ = 31533015186. Its totient is φ = 10511005060.

The previous prime is 21022010111. The next prime is 21022010171. The reversal of 21022010122 is 22101022012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15820859961 + 5201150161 = 125781^2 + 72119^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255502529 + ... + 5255502532.

Almost surely, 2^21022010122 is an apocalyptic number.

21022010122 is a deficient number, since it is larger than the sum of its proper divisors (10511005064).

21022010122 is a wasteful number, since it uses less digits than its factorization.

21022010122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10511005063.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21022010122 its reverse (22101022012), we get a palindrome (43123032134).

The spelling of 21022010122 in words is "twenty-one billion, twenty-two million, ten thousand, one hundred twenty-two".