21161402 has 16 divisors (see below), whose sum is σ = 33635040. Its totient is φ = 9957168.

The previous prime is 21161381. The next prime is 21161407. The reversal of 21161402 is 20416112.

It is not an unprimeable number, because it can be changed into a prime (21161407) 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 7 ways as a sum of consecutive naturals, for example, 4193 + ... + 7739.

It is an arithmetic number, because the mean of its divisors is an integer number (2102190).

Almost surely, 2^21161402 is an apocalyptic number.

21161402 is a deficient number, since it is larger than the sum of its proper divisors (12473638).

21161402 is a wasteful number, since it uses less digits than its factorization.

21161402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3725.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21161402 is about 4600.1523887802. The cubic root of 21161402 is about 276.5974333627.

Adding to 21161402 its reverse (20416112), we get a palindrome (41577514).

The spelling of 21161402 in words is "twenty-one million, one hundred sixty-one thousand, four hundred two".