169002421 has 36 divisors (see below), whose sum is σ = 210782124. Its totient is φ = 134991360.

The previous prime is 169002419. The next prime is 169002433. The reversal of 169002421 is 124200961.

It can be written as a sum of positive squares in 2 ways, for example, as 117722500 + 51279921 = 10850^2 + 7161^2 .

It is not a de Polignac number, because 169002421 - 2¹ = 169002419 is a prime.

It is a super-2 number, since 2×169002421² = 57123636607722482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169002221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1742245 + ... + 1742341.

It is an arithmetic number, because the mean of its divisors is an integer number (5855059).

Almost surely, 2^169002421 is an apocalyptic number.

It is an amenable number.

169002421 is a deficient number, since it is larger than the sum of its proper divisors (41779703).

169002421 is an equidigital number, since it uses as much as digits as its factorization.

169002421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 169002421 is about 13000.0931150511. The cubic root of 169002421 is about 552.8801214270.

It can be divided in two parts, 16900 and 2421, that added together give a square (19321 = 139²).

The spelling of 169002421 in words is "one hundred sixty-nine million, two thousand, four hundred twenty-one".