2104021731 has 24 divisors (see below), whose sum is σ = 3280333584. Its totient is φ = 1196052480.

The previous prime is 2104021727. The next prime is 2104021741. The reversal of 2104021731 is 1371204012.

It is not a de Polignac number, because 2104021731 - 2² = 2104021727 is a prime.

It is a super-2 number, since 2×2104021731² = 8853814889040472722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 2104021698 and 2104021707.

It is not an unprimeable number, because it can be changed into a prime (2104021741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8710 + ... + 65451.

It is an arithmetic number, because the mean of its divisors is an integer number (136680566).

Almost surely, 2^2104021731 is an apocalyptic number.

2104021731 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2104021731 is a deficient number, since it is larger than the sum of its proper divisors (1176311853).

2104021731 is a wasteful number, since it uses less digits than its factorization.

2104021731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74371 (or 74364 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 2104021731 is about 45869.6166432640. The cubic root of 2104021731 is about 1281.3961270067.

Adding to 2104021731 its reverse (1371204012), we get a palindrome (3475225743).

The spelling of 2104021731 in words is "two billion, one hundred four million, twenty-one thousand, seven hundred thirty-one".