2042121781 has 8 divisors (see below), whose sum is σ = 2339426880. Its totient is φ = 1746210048.

The previous prime is 2042121749. The next prime is 2042121793. The reversal of 2042121781 is 1871212402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2042121781 - 2⁵ = 2042121749 is a prime.

It is a super-2 number, since 2×2042121781² = 8340522736869223922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2042121701) 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 7 ways as a sum of consecutive naturals, for example, 345196 + ... + 351061.

It is an arithmetic number, because the mean of its divisors is an integer number (292428360).

Almost surely, 2^2042121781 is an apocalyptic number.

It is an amenable number.

2042121781 is a deficient number, since it is larger than the sum of its proper divisors (297305099).

2042121781 is an equidigital number, since it uses as much as digits as its factorization.

2042121781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696683.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 2042121781 is about 45189.8415686535. The cubic root of 2042121781 is about 1268.7046914798.

The spelling of 2042121781 in words is "two billion, forty-two million, one hundred twenty-one thousand, seven hundred eighty-one".