1221432154252 has 6 divisors (see below), whose sum is σ = 2137506269948. Its totient is φ = 610716077124.

The previous prime is 1221432154249. The next prime is 1221432154289. The reversal of 1221432154252 is 2524512341221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152679019278 + ... + 152679019285.

Almost surely, 2^{1221432154252} is an apocalyptic number.

It is an amenable number.

1221432154252 is a deficient number, since it is larger than the sum of its proper divisors (916074115696).

1221432154252 is a wasteful number, since it uses less digits than its factorization.

1221432154252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305358038567 (or 305358038565 counting only the distinct ones).

The product of its digits is 38400, while the sum is 34.

Adding to 1221432154252 its reverse (2524512341221), we get a palindrome (3745944495473).

The spelling of 1221432154252 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-two million, one hundred fifty-four thousand, two hundred fifty-two".