212021334 has 64 divisors (see below), whose sum is σ = 549504000. Its totient is φ = 60572232.

The previous prime is 212021333. The next prime is 212021353. The reversal of 212021334 is 433120212.

It is a super-2 number, since 2×212021334² = 89906092142279112, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021333) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12799 + ... + 24245.

It is an arithmetic number, because the mean of its divisors is an integer number (8586000).

Almost surely, 2^212021334 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212021334, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274752000).

212021334 is an abundant number, since it is smaller than the sum of its proper divisors (337482666).

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

212021334 is a wasteful number, since it uses less digits than its factorization.

212021334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11479 (or 11459 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 212021334 is about 14560.9523726987. The cubic root of 212021334 is about 596.2931965066.

Adding to 212021334 its reverse (433120212), we get a palindrome (645141546).

The spelling of 212021334 in words is "two hundred twelve million, twenty-one thousand, three hundred thirty-four".