21020021122 has 8 divisors (see below), whose sum is σ = 32299056972. Its totient is φ = 10253668800.

The previous prime is 21020021101. The next prime is 21020021131. The reversal of 21020021122 is 22112002012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16348435321 + 4671585801 = 127861^2 + 68349^2 .

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

It is a super-2 number, since 2×21020021122² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128170779 + ... + 128170942.

Almost surely, 2^21020021122 is an apocalyptic number.

21020021122 is a deficient number, since it is larger than the sum of its proper divisors (11279035850).

21020021122 is a wasteful number, since it uses less digits than its factorization.

21020021122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256341764.

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

Adding to 21020021122 its reverse (22112002012), we get a palindrome (43132023134).

The spelling of 21020021122 in words is "twenty-one billion, twenty million, twenty-one thousand, one hundred twenty-two".