1221053530 has 8 divisors (see below), whose sum is σ = 2197896372. Its totient is φ = 488421408.

The previous prime is 1221053521. The next prime is 1221053573. The reversal of 1221053530 is 353501221.

It can be written as a sum of positive squares in 2 ways, for example, as 1219615929 + 1437601 = 34923^2 + 1199^2 .

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

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, 61052667 + ... + 61052686.

Almost surely, 2^1221053530 is an apocalyptic number.

1221053530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221053530 is a deficient number, since it is larger than the sum of its proper divisors (976842842).

1221053530 is a wasteful number, since it uses less digits than its factorization.

1221053530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122105360.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 1221053530 is about 34943.5763767820. The cubic root of 1221053530 is about 1068.8372176465.

Adding to 1221053530 its reverse (353501221), we get a palindrome (1574554751).

The spelling of 1221053530 in words is "one billion, two hundred twenty-one million, fifty-three thousand, five hundred thirty".