61019923821 has 16 divisors (see below), whose sum is σ = 82431264000. Its totient is φ = 40144785408.

The previous prime is 61019923819. The next prime is 61019923859. The reversal of 61019923821 is 12832991016.

It is not a de Polignac number, because 61019923821 - 2¹ = 61019923819 is a prime.

It is a super-2 number, since 2×61019923821² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61019923121) 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 15 ways as a sum of consecutive naturals, for example, 414205 + ... + 541853.

It is an arithmetic number, because the mean of its divisors is an integer number (5151954000).

Almost surely, 2^61019923821 is an apocalyptic number.

It is an amenable number.

61019923821 is a deficient number, since it is larger than the sum of its proper divisors (21411340179).

61019923821 is a wasteful number, since it uses less digits than its factorization.

61019923821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129748.

The product of its (nonzero) digits is 46656, while the sum is 42.

The spelling of 61019923821 in words is "sixty-one billion, nineteen million, nine hundred twenty-three thousand, eight hundred twenty-one".