1718214921 has 12 divisors (see below), whose sum is σ = 2542399860. Its totient is φ = 1117537920.

The previous prime is 1718214863. The next prime is 1718214923. The reversal of 1718214921 is 1294128171.

It can be written as a sum of positive squares in 2 ways, for example, as 706974921 + 1011240000 = 26589^2 + 31800^2 .

It is not a de Polignac number, because 1718214921 - 2¹³ = 1718206729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1718214923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2327836 + ... + 2328573.

It is an arithmetic number, because the mean of its divisors is an integer number (211866655).

Almost surely, 2^1718214921 is an apocalyptic number.

It is an amenable number.

1718214921 is a deficient number, since it is larger than the sum of its proper divisors (824184939).

1718214921 is a wasteful number, since it uses less digits than its factorization.

1718214921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4656456 (or 4656453 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 1718214921 is about 41451.3560815566. The cubic root of 1718214921 is about 1197.7306464842.

The spelling of 1718214921 in words is "one billion, seven hundred eighteen million, two hundred fourteen thousand, nine hundred twenty-one".