1221652105 has 8 divisors (see below), whose sum is σ = 1467773064. Its totient is φ = 976128000.

The previous prime is 1221652097. The next prime is 1221652111. The reversal of 1221652105 is 5012561221.

It can be written as a sum of positive squares in 4 ways, for example, as 336649104 + 885003001 = 18348^2 + 29749^2 .

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

It is not a de Polignac number, because 1221652105 - 2³ = 1221652097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221652105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144696 + ... + 152905.

It is an arithmetic number, because the mean of its divisors is an integer number (183471633).

Almost surely, 2^1221652105 is an apocalyptic number.

It is an amenable number.

1221652105 is a deficient number, since it is larger than the sum of its proper divisors (246120959).

1221652105 is an equidigital number, since it uses as much as digits as its factorization.

1221652105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298427.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1221652105 is about 34952.1402062878. The cubic root of 1221652105 is about 1069.0118413650.

The spelling of 1221652105 in words is "one billion, two hundred twenty-one million, six hundred fifty-two thousand, one hundred five".