1220215564 has 12 divisors (see below), whose sum is σ = 2135988904. Its totient is φ = 609933024.

The previous prime is 1220215561. The next prime is 1220215567. The reversal of 1220215564 is 4655120221.

It is an interprime number because it is at equal distance from previous prime (1220215561) and next prime (1220215567).

It is not an unprimeable number, because it can be changed into a prime (1220215561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27297 + ... + 56440.

Almost surely, 2^1220215564 is an apocalyptic number.

It is an amenable number.

1220215564 is a deficient number, since it is larger than the sum of its proper divisors (915773340).

1220215564 is a wasteful number, since it uses less digits than its factorization.

1220215564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87384 (or 87382 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1220215564 is about 34931.5840465330. The cubic root of 1220215564 is about 1068.5926599243.

Adding to 1220215564 its reverse (4655120221), we get a palindrome (5875335785).

The spelling of 1220215564 in words is "one billion, two hundred twenty million, two hundred fifteen thousand, five hundred sixty-four".