61221121244340 has 96 divisors (see below), whose sum is σ = 172101904257024. Its totient is φ = 16260710444160.

The previous prime is 61221121244287. The next prime is 61221121244417. The reversal of 61221121244340 is 4344212112216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17353137 + ... + 20580903.

It is an arithmetic number, because the mean of its divisors is an integer number (1792728169344).

Almost surely, 2^{61221121244340} is an apocalyptic number.

61221121244340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61221121244340 is an abundant number, since it is smaller than the sum of its proper divisors (110880783012684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61221121244340 is a wasteful number, since it uses less digits than its factorization.

61221121244340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3229037 (or 3229035 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

Adding to 61221121244340 its reverse (4344212112216), we get a palindrome (65565333356556).

The spelling of 61221121244340 in words is "sixty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred forty-four thousand, three hundred forty".