1221552002 has 32 divisors (see below), whose sum is σ = 2036349504. Its totient is φ = 544939200.

The previous prime is 1221551987. The next prime is 1221552019. The reversal of 1221552002 is 2002551221.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284552 + ... + 288812.

It is an arithmetic number, because the mean of its divisors is an integer number (63635922).

Almost surely, 2^1221552002 is an apocalyptic number.

1221552002 is a deficient number, since it is larger than the sum of its proper divisors (814797502).

1221552002 is a wasteful number, since it uses less digits than its factorization.

1221552002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4514.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1221552002 is about 34950.7081759440. The cubic root of 1221552002 is about 1068.9826420496.

The spelling of 1221552002 in words is "one billion, two hundred twenty-one million, five hundred fifty-two thousand, two".