1221540334 has 8 divisors (see below), whose sum is σ = 2094069168. Its totient is φ = 523517280.

The previous prime is 1221540319. The next prime is 1221540377. The reversal of 1221540334 is 4330451221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1221540299 and 1221540308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43626427 + ... + 43626454.

It is an arithmetic number, because the mean of its divisors is an integer number (261758646).

Almost surely, 2^1221540334 is an apocalyptic number.

1221540334 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1221540334 is a deficient number, since it is larger than the sum of its proper divisors (872528834).

1221540334 is an equidigital number, since it uses as much as digits as its factorization.

1221540334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87252890.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1221540334 is about 34950.5412547503. The cubic root of 1221540334 is about 1068.9792384753.

Adding to 1221540334 its reverse (4330451221), we get a palindrome (5551991555).

The spelling of 1221540334 in words is "one billion, two hundred twenty-one million, five hundred forty thousand, three hundred thirty-four".