21212212021022 has 32 divisors (see below), whose sum is σ = 34753443845760. Its totient is φ = 9630096109920.

The previous prime is 21212212021001. The next prime is 21212212021151. The reversal of 21212212021022 is 22012021221212.

It is a junction number, because it is equal to n+sod(n) for n = 21212212020985 and 21212212021003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 490060193 + ... + 490103475.

It is an arithmetic number, because the mean of its divisors is an integer number (1086045120180).

Almost surely, 2^{21212212021022} is an apocalyptic number.

21212212021022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21212212021022 is a deficient number, since it is larger than the sum of its proper divisors (13541231824738).

21212212021022 is a wasteful number, since it uses less digits than its factorization.

21212212021022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70088.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21212212021022 its reverse (22012021221212), we get a palindrome (43224233242234).

The spelling of 21212212021022 in words is "twenty-one trillion, two hundred twelve billion, two hundred twelve million, twenty-one thousand, twenty-two".