61221204515 has 8 divisors (see below), whose sum is σ = 75835298688. Its totient is φ = 47397061440.

The previous prime is 61221204503. The next prime is 61221204529. The reversal of 61221204515 is 51540212216.

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

It is not a de Polignac number, because 61221204515 - 2¹² = 61221200419 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197487602 + ... + 197487911.

It is an arithmetic number, because the mean of its divisors is an integer number (9479412336).

Almost surely, 2^61221204515 is an apocalyptic number.

61221204515 is a deficient number, since it is larger than the sum of its proper divisors (14614094173).

61221204515 is a wasteful number, since it uses less digits than its factorization.

61221204515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394975549.

The product of its (nonzero) digits is 4800, while the sum is 29.

The spelling of 61221204515 in words is "sixty-one billion, two hundred twenty-one million, two hundred four thousand, five hundred fifteen".