2151221352 has 64 divisors (see below), whose sum is σ = 6168355200. Its totient is φ = 612433920.

The previous prime is 2151221309. The next prime is 2151221357. The reversal of 2151221352 is 2531221512.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (2151221357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24424 + ... + 69992.

It is an arithmetic number, because the mean of its divisors is an integer number (96380550).

Almost surely, 2^2151221352 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 2151221352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3084177600).

2151221352 is an abundant number, since it is smaller than the sum of its proper divisors (4017133848).

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

2151221352 is a wasteful number, since it uses less digits than its factorization.

2151221352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45866 (or 45862 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 2151221352 is about 46381.2607849334. The cubic root of 2151221352 is about 1290.9072303316.

Adding to 2151221352 its reverse (2531221512), we get a palindrome (4682442864).

The spelling of 2151221352 in words is "two billion, one hundred fifty-one million, two hundred twenty-one thousand, three hundred fifty-two".