213021354 has 64 divisors (see below), whose sum is σ = 547190784. Its totient is φ = 53735616.

The previous prime is 213021349. The next prime is 213021379. The reversal of 213021354 is 453120312.

213021354 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 213021354.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4077 + ... + 21039.

It is an arithmetic number, because the mean of its divisors is an integer number (8549856).

Almost surely, 2^213021354 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213021354, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273595392).

213021354 is an abundant number, since it is smaller than the sum of its proper divisors (334169430).

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

213021354 is a wasteful number, since it uses less digits than its factorization.

213021354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17011.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 213021354 is about 14595.2510769771. The cubic root of 213021354 is about 597.2292187595.

Adding to 213021354 its reverse (453120312), we get a palindrome (666141666).

The spelling of 213021354 in words is "two hundred thirteen million, twenty-one thousand, three hundred fifty-four".