21121212022 has 16 divisors (see below), whose sum is σ = 33751085760. Its totient is φ = 9884243592.

The previous prime is 21121212019. The next prime is 21121212031. The reversal of 21121212022 is 22021212112.

It is a happy number.

It is a super-2 number, since 2×21121212022² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121211987 and 21121212005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3345168 + ... + 3351475.

It is an arithmetic number, because the mean of its divisors is an integer number (2109442860).

Almost surely, 2^21121212022 is an apocalyptic number.

21121212022 is a deficient number, since it is larger than the sum of its proper divisors (12629873738).

21121212022 is a wasteful number, since it uses less digits than its factorization.

21121212022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6696747.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21121212022 its reverse (22021212112), we get a palindrome (43142424134).

The spelling of 21121212022 in words is "twenty-one billion, one hundred twenty-one million, two hundred twelve thousand, twenty-two".