2129236678 has 4 divisors (see below), whose sum is σ = 3193855020. Its totient is φ = 1064618338.

The previous prime is 2129236673. The next prime is 2129236693. The reversal of 2129236678 is 8766329212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129236673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 532309168 + ... + 532309171.

It is an arithmetic number, because the mean of its divisors is an integer number (798463755).

Almost surely, 2^2129236678 is an apocalyptic number.

2129236678 is a deficient number, since it is larger than the sum of its proper divisors (1064618342).

2129236678 is a wasteful number, since it uses less digits than its factorization.

2129236678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064618341.

The product of its digits is 435456, while the sum is 46.

The square root of 2129236678 is about 46143.6526295871. The cubic root of 2129236678 is about 1286.4946353651.

It can be divided in two parts, 21292 and 36678, that added together give a triangular number (57970 = T₃₄₀).

The spelling of 2129236678 in words is "two billion, one hundred twenty-nine million, two hundred thirty-six thousand, six hundred seventy-eight".