61721012300420 has 96 divisors (see below), whose sum is σ = 146590296652800. Its totient is φ = 21623065587200.

The previous prime is 61721012300411. The next prime is 61721012300429. The reversal of 61721012300420 is 2400321012716.

It is an interprime number because it is at equal distance from previous prime (61721012300411) and next prime (61721012300429).

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (61721012300429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7551380 + ... + 13433739.

It is an arithmetic number, because the mean of its divisors is an integer number (1526982256800).

Almost surely, 2^{61721012300420} is an apocalyptic number.

It is an amenable number.

61721012300420 is an abundant number, since it is smaller than the sum of its proper divisors (84869284352380).

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

61721012300420 is a wasteful number, since it uses less digits than its factorization.

61721012300420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20985629 (or 20985627 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The spelling of 61721012300420 in words is "sixty-one trillion, seven hundred twenty-one billion, twelve million, three hundred thousand, four hundred twenty".