61820921043042 has 48 divisors (see below), whose sum is σ = 147715515722880. Its totient is φ = 17185738665312.

The previous prime is 61820921043041. The next prime is 61820921043047. The reversal of 61820921043042 is 24034012902816.

It is a happy number.

It is a super-2 number, since 2×61820921043042² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 61820921042985 and 61820921043003.

It is not an unprimeable number, because it can be changed into a prime (61820921043041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2841546442 + ... + 2841568197.

It is an arithmetic number, because the mean of its divisors is an integer number (3077406577560).

Almost surely, 2^{61820921043042} is an apocalyptic number.

61820921043042 is an abundant number, since it is smaller than the sum of its proper divisors (85894594679838).

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

61820921043042 is a wasteful number, since it uses less digits than its factorization.

61820921043042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5683114695 (or 5683114688 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

Adding to 61820921043042 its reverse (24034012902816), we get a palindrome (85854933945858).

The spelling of 61820921043042 in words is "sixty-one trillion, eight hundred twenty billion, nine hundred twenty-one million, forty-three thousand, forty-two".