1221553222035 has 16 divisors (see below), whose sum is σ = 1954499466240. Its totient is φ = 651490281440.

The previous prime is 1221553222031. The next prime is 1221553222091. The reversal of 1221553222035 is 5302223551221.

It is not a de Polignac number, because 1221553222035 - 2² = 1221553222031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221553221987 and 1221553222005.

It is not an unprimeable number, because it can be changed into a prime (1221553222031) 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, 2984926 + ... + 3369404.

It is an arithmetic number, because the mean of its divisors is an integer number (122156216640).

Almost surely, 2^{1221553222035} is an apocalyptic number.

1221553222035 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221553222035 is a deficient number, since it is larger than the sum of its proper divisors (732946244205).

1221553222035 is a wasteful number, since it uses less digits than its factorization.

1221553222035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596298.

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 1221553222035 its reverse (5302223551221), we get a palindrome (6523776773256).

The spelling of 1221553222035 in words is "one trillion, two hundred twenty-one billion, five hundred fifty-three million, two hundred twenty-two thousand, thirty-five".