2120922778 has 8 divisors (see below), whose sum is σ = 3426106068. Its totient is φ = 978887424.

The previous prime is 2120922773. The next prime is 2120922779. The reversal of 2120922778 is 8772290212.

It can be written as a sum of positive squares in 2 ways, for example, as 2061432409 + 59490369 = 45403^2 + 7713^2 .

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

It is a super-3 number, since 3×2120922778³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2120922778.

It is not an unprimeable number, because it can be changed into a prime (2120922773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40786951 + ... + 40787002.

Almost surely, 2^2120922778 is an apocalyptic number.

2120922778 is a deficient number, since it is larger than the sum of its proper divisors (1305183290).

2120922778 is a wasteful number, since it uses less digits than its factorization.

2120922778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81573968.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 2120922778 is about 46053.4773714212. The cubic root of 2120922778 is about 1284.8180190141.

The spelling of 2120922778 in words is "two billion, one hundred twenty million, nine hundred twenty-two thousand, seven hundred seventy-eight".