2139460021 has 8 divisors (see below), whose sum is σ = 2253366080. Its totient is φ = 2025684288.

The previous prime is 2139460019. The next prime is 2139460079. The reversal of 2139460021 is 1200649312.

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 2139460021 - 2¹ = 2139460019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139460091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2080 + ... + 65446.

It is an arithmetic number, because the mean of its divisors is an integer number (281670760).

Almost surely, 2^2139460021 is an apocalyptic number.

It is an amenable number.

2139460021 is a deficient number, since it is larger than the sum of its proper divisors (113906059).

2139460021 is a wasteful number, since it uses less digits than its factorization.

2139460021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65163.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 2139460021 is about 46254.2973246811. The cubic root of 2139460021 is about 1288.5503457828.

The spelling of 2139460021 in words is "two billion, one hundred thirty-nine million, four hundred sixty thousand, twenty-one".