21022012122 has 8 divisors (see below), whose sum is σ = 42044024256. Its totient is φ = 7007337372.

The previous prime is 21022012103. The next prime is 21022012127. The reversal of 21022012122 is 22121022012.

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

21022012122 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21022012127) 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, 1751834338 + ... + 1751834349.

It is an arithmetic number, because the mean of its divisors is an integer number (5255503032).

Almost surely, 2^21022012122 is an apocalyptic number.

21022012122 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.

21022012122 is a wasteful number, since it uses less digits than its factorization.

21022012122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503668692.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21022012122 its reverse (22121022012), we get a palindrome (43143034134).

The spelling of 21022012122 in words is "twenty-one billion, twenty-two million, twelve thousand, one hundred twenty-two".