61221512203 has 2 divisors, whose sum is σ = 61221512204. Its totient is φ = 61221512202.

The previous prime is 61221512201. The next prime is 61221512239. The reversal of 61221512203 is 30221512216.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61221512203 - 2¹ = 61221512201 is a prime.

Together with 61221512201, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61221512201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30610756101 + 30610756102.

It is an arithmetic number, because the mean of its divisors is an integer number (30610756102).

Almost surely, 2^61221512203 is an apocalyptic number.

61221512203 is a deficient number, since it is larger than the sum of its proper divisors (1).

61221512203 is an equidigital number, since it uses as much as digits as its factorization.

61221512203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The spelling of 61221512203 in words is "sixty-one billion, two hundred twenty-one million, five hundred twelve thousand, two hundred three".