1212543321 has 16 divisors (see below), whose sum is σ = 1771412160. Its totient is φ = 731661120.

The previous prime is 1212543313. The next prime is 1212543337. The reversal of 1212543321 is 1233452121.

It is not a de Polignac number, because 1212543321 - 2³ = 1212543313 is a prime.

It is a super-2 number, since 2×1212543321² = 2940522610603418082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1212543291 and 1212543300.

It is not an unprimeable number, because it can be changed into a prime (1212543301) 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, 72670 + ... + 87783.

It is an arithmetic number, because the mean of its divisors is an integer number (110713260).

Almost surely, 2^1212543321 is an apocalyptic number.

1212543321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212543321 is a deficient number, since it is larger than the sum of its proper divisors (558868839).

1212543321 is a wasteful number, since it uses less digits than its factorization.

1212543321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160696.

The product of its digits is 1440, while the sum is 24.

The square root of 1212543321 is about 34821.5927407119. The cubic root of 1212543321 is about 1066.3483171825.

Adding to 1212543321 its reverse (1233452121), we get a palindrome (2445995442).

The spelling of 1212543321 in words is "one billion, two hundred twelve million, five hundred forty-three thousand, three hundred twenty-one".