2687386021 has 4 divisors (see below), whose sum is σ = 2695505344. Its totient is φ = 2679266700.

The previous prime is 2687386003. The next prime is 2687386043. The reversal of 2687386021 is 1206837862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1206837862 = 2 ⋅603418931.

It is a cyclic number.

It is not a de Polignac number, because 2687386021 - 2⁵ = 2687385989 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 (2687386921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4059165 + ... + 4059826.

It is an arithmetic number, because the mean of its divisors is an integer number (673876336).

Almost surely, 2^2687386021 is an apocalyptic number.

It is an amenable number.

2687386021 is a deficient number, since it is larger than the sum of its proper divisors (8119323).

2687386021 is an equidigital number, since it uses as much as digits as its factorization.

2687386021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8119322.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 2687386021 is about 51840.0040605708. The cubic root of 2687386021 is about 1390.3047864328.

The spelling of 2687386021 in words is "two billion, six hundred eighty-seven million, three hundred eighty-six thousand, twenty-one".