21020020122 has 8 divisors (see below), whose sum is σ = 42040040256. Its totient is φ = 7006673372.

The previous prime is 21020020121. The next prime is 21020020129. The reversal of 21020020122 is 22102002012.

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

21020020122 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21020020098 and 21020020107.

It is not an unprimeable number, because it can be changed into a prime (21020020121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1751668338 + ... + 1751668349.

It is an arithmetic number, because the mean of its divisors is an integer number (5255005032).

Almost surely, 2^21020020122 is an apocalyptic number.

21020020122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020020122 is a wasteful number, since it uses less digits than its factorization.

21020020122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503336692.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21020020122 its reverse (22102002012), we get a palindrome (43122022134).

It can be divided in two parts, 2102002012 and 2, that multiplied together give a palindrome (4204004024).

The spelling of 21020020122 in words is "twenty-one billion, twenty million, twenty thousand, one hundred twenty-two".