21351101 has 8 divisors (see below), whose sum is σ = 21648384. Its totient is φ = 21055840.

The previous prime is 21351073. The next prime is 21351131. The reversal of 21351101 is 10115312.

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

It is a cyclic number.

It is not a de Polignac number, because 21351101 - 2¹⁴ = 21334717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21351131) 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, 40721 + ... + 41241.

It is an arithmetic number, because the mean of its divisors is an integer number (2706048).

Almost surely, 2^21351101 is an apocalyptic number.

It is an amenable number.

21351101 is a deficient number, since it is larger than the sum of its proper divisors (297283).

21351101 is a wasteful number, since it uses less digits than its factorization.

21351101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 21351101 is about 4620.7251595394. The cubic root of 21351101 is about 277.4214846994.

Adding to 21351101 its reverse (10115312), we get a palindrome (31466413).

The spelling of 21351101 in words is "twenty-one million, three hundred fifty-one thousand, one hundred one".