21161002 has 8 divisors (see below), whose sum is σ = 32515812. Its totient is φ = 10322400.

The previous prime is 21160973. The next prime is 21161017. The reversal of 21161002 is 20016112.

It can be written as a sum of positive squares in 2 ways, for example, as 21150801 + 10201 = 4599^2 + 101^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128949 + ... + 129112.

Almost surely, 2^21161002 is an apocalyptic number.

21161002 is a deficient number, since it is larger than the sum of its proper divisors (11354810).

21161002 is a wasteful number, since it uses less digits than its factorization.

21161002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258104.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21161002 is about 4600.1089117542. The cubic root of 21161002 is about 276.5956905722.

Adding to 21161002 its reverse (20016112), we get a palindrome (41177114).

The spelling of 21161002 in words is "twenty-one million, one hundred sixty-one thousand, two".