2121886742 has 4 divisors (see below), whose sum is σ = 3182830116. Its totient is φ = 1060943370.

The previous prime is 2121886727. The next prime is 2121886763. The reversal of 2121886742 is 2476881212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2121886742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 530471684 + ... + 530471687.

It is an arithmetic number, because the mean of its divisors is an integer number (795707529).

Almost surely, 2^2121886742 is an apocalyptic number.

2121886742 is a deficient number, since it is larger than the sum of its proper divisors (1060943374).

2121886742 is a wasteful number, since it uses less digits than its factorization.

2121886742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060943373.

The product of its digits is 86016, while the sum is 41.

The square root of 2121886742 is about 46063.9418851665. The cubic root of 2121886742 is about 1285.0126403900.

The spelling of 2121886742 in words is "two billion, one hundred twenty-one million, eight hundred eighty-six thousand, seven hundred forty-two".