21212010221022 has 96 divisors (see below), whose sum is σ = 47596664828160. Its totient is φ = 7002497446560.

The previous prime is 21212010220993. The next prime is 21212010221041. The reversal of 21212010221022 is 22012201021212.

It is a happy number.

21212010221022 is a `hidden beast` number, since 212 + 120 + 102 + 210 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21212010220986 and 21212010221004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1623817263 + ... + 1623830325.

It is an arithmetic number, because the mean of its divisors is an integer number (495798591960).

Almost surely, 2^{21212010221022} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21212010221022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23798332414080).

21212010221022 is an abundant number, since it is smaller than the sum of its proper divisors (26384654607138).

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

21212010221022 is a wasteful number, since it uses less digits than its factorization.

21212010221022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15823 (or 15708 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21212010221022 its reverse (22012201021212), we get a palindrome (43224211242234).

The spelling of 21212010221022 in words is "twenty-one trillion, two hundred twelve billion, ten million, two hundred twenty-one thousand, twenty-two".