21100485 has 32 divisors (see below), whose sum is σ = 40856832. Its totient is φ = 9077760.

The previous prime is 21100463. The next prime is 21100489. The reversal of 21100485 is 58400112.

It is not a de Polignac number, because 21100485 - 2⁷ = 21100357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100489) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4126 + ... + 7695.

It is an arithmetic number, because the mean of its divisors is an integer number (1276776).

Almost surely, 2^21100485 is an apocalyptic number.

It is an amenable number.

21100485 is a deficient number, since it is larger than the sum of its proper divisors (19756347).

21100485 is a wasteful number, since it uses less digits than its factorization.

21100485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11853.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 21100485 is about 4593.5264231307. The cubic root of 21100485 is about 276.3317660269.

Adding to 21100485 its reverse (58400112), we get a palindrome (79500597).

The spelling of 21100485 in words is "twenty-one million, one hundred thousand, four hundred eighty-five".