2021684674 has 4 divisors (see below), whose sum is σ = 3032527014. Its totient is φ = 1010842336.

The previous prime is 2021684671. The next prime is 2021684681. The reversal of 2021684674 is 4764861202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4764861202 = 2 ⋅2382430601.

It can be written as a sum of positive squares in only one way, i.e., 1218359025 + 803325649 = 34905^2 + 28343^2 .

It is not an unprimeable number, because it can be changed into a prime (2021684671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505421167 + ... + 505421170.

Almost surely, 2^2021684674 is an apocalyptic number.

2021684674 is a deficient number, since it is larger than the sum of its proper divisors (1010842340).

2021684674 is a wasteful number, since it uses less digits than its factorization.

2021684674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010842339.

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 2021684674 is about 44963.1479547418. The cubic root of 2021684674 is about 1264.4581876708.

The spelling of 2021684674 in words is "two billion, twenty-one million, six hundred eighty-four thousand, six hundred seventy-four".