1221071624 has 32 divisors (see below), whose sum is σ = 2303716800. Its totient is φ = 606761280.

The previous prime is 1221071603. The next prime is 1221071629. The reversal of 1221071624 is 4261701221.

It is a junction number, because it is equal to n+sod(n) for n = 1221071593 and 1221071602.

It is not an unprimeable number, because it can be changed into a prime (1221071629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1328237 + ... + 1329155.

It is an arithmetic number, because the mean of its divisors is an integer number (71991150).

Almost surely, 2^1221071624 is an apocalyptic number.

It is an amenable number.

1221071624 is a deficient number, since it is larger than the sum of its proper divisors (1082645176).

1221071624 is a wasteful number, since it uses less digits than its factorization.

1221071624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773 (or 1769 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 1221071624 is about 34943.8352789158. The cubic root of 1221071624 is about 1068.8424970889.

Adding to 1221071624 its reverse (4261701221), we get a palindrome (5482772845).

The spelling of 1221071624 in words is "one billion, two hundred twenty-one million, seventy-one thousand, six hundred twenty-four".