61221018002 has 8 divisors (see below), whose sum is σ = 91832672316. Its totient is φ = 30610127232.

The previous prime is 61221017987. The next prime is 61221018043. The reversal of 61221018002 is 20081012216.

It can be written as a sum of positive squares in 2 ways, for example, as 60973931041 + 247086961 = 246929^2 + 15719^2 .

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, 95498 + ... + 362714.

Almost surely, 2^61221018002 is an apocalyptic number.

61221018002 is a deficient number, since it is larger than the sum of its proper divisors (30611654314).

61221018002 is a wasteful number, since it uses less digits than its factorization.

61221018002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381772.

The product of its (nonzero) digits is 384, while the sum is 23.

The spelling of 61221018002 in words is "sixty-one billion, two hundred twenty-one million, eighteen thousand, two".