21020210122212 has 144 divisors (see below), whose sum is σ = 61648726618752. Its totient is φ = 5914472256000.

The previous prime is 21020210122207. The next prime is 21020210122213. The reversal of 21020210122212 is 21222101202012.

It is a happy number.

21020210122212 is a `hidden beast` number, since 210 + 20 + 210 + 1 + 2 + 221 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21020210122213) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60490962 + ... + 60837462.

Almost surely, 2^{21020210122212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020210122212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30824363309376).

21020210122212 is an abundant number, since it is smaller than the sum of its proper divisors (40628516496540).

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

21020210122212 is a wasteful number, since it uses less digits than its factorization.

21020210122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350178 (or 350173 counting only the distinct ones).

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

Adding to 21020210122212 its reverse (21222101202012), we get a palindrome (42242311324224).

The spelling of 21020210122212 in words is "twenty-one trillion, twenty billion, two hundred ten million, one hundred twenty-two thousand, two hundred twelve".