21161030 has 16 divisors (see below), whose sum is σ = 41552784. Its totient is φ = 7694880.

The previous prime is 21161027. The next prime is 21161033. The reversal of 21161030 is 3016112.

It is an interprime number because it is at equal distance from previous prime (21161027) and next prime (21161033).

It is a junction number, because it is equal to n+sod(n) for n = 21160996 and 21161014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96077 + ... + 96296.

It is an arithmetic number, because the mean of its divisors is an integer number (2597049).

Almost surely, 2^21161030 is an apocalyptic number.

21161030 is a deficient number, since it is larger than the sum of its proper divisors (20391754).

21161030 is a wasteful number, since it uses less digits than its factorization.

21161030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192391.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 21161030 is about 4600.1119551594. Note that the first 3 decimals coincide. The cubic root of 21161030 is about 276.5958125683.

Adding to 21161030 its reverse (3016112), we get a palindrome (24177142).

It can be divided in two parts, 21 and 161030, that added together give a 5-th power (161051 = 11⁵).

The spelling of 21161030 in words is "twenty-one million, one hundred sixty-one thousand, thirty".