1222021655 has 8 divisors (see below), whose sum is σ = 1471838784. Its totient is φ = 974008800.

The previous prime is 1222021621. The next prime is 1222021673. The reversal of 1222021655 is 5561202221.

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

It is a de Polignac number, because none of the positive numbers 2^k-1222021655 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 449576 + ... + 452285.

It is an arithmetic number, because the mean of its divisors is an integer number (183979848).

Almost surely, 2^1222021655 is an apocalyptic number.

1222021655 is a deficient number, since it is larger than the sum of its proper divisors (249817129).

1222021655 is an equidigital number, since it uses as much as digits as its factorization.

1222021655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902137.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1222021655 is about 34957.4263211696. The cubic root of 1222021655 is about 1069.1196225946.

Adding to 1222021655 its reverse (5561202221), we get a palindrome (6783223876).

The spelling of 1222021655 in words is "one billion, two hundred twenty-two million, twenty-one thousand, six hundred fifty-five".