21151101 has 8 divisors (see below), whose sum is σ = 28222720. Its totient is φ = 14090112.

The previous prime is 21151069. The next prime is 21151147. The reversal of 21151101 is 10115112.

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

It is not a de Polignac number, because 21151101 - 2⁵ = 21151069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151171) 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, 6420 + ... + 9138.

It is an arithmetic number, because the mean of its divisors is an integer number (3527840).

Almost surely, 2^21151101 is an apocalyptic number.

It is an amenable number.

21151101 is a deficient number, since it is larger than the sum of its proper divisors (7071619).

21151101 is a wasteful number, since it uses less digits than its factorization.

21151101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5315.

The product of its (nonzero) digits is 10, while the sum is 12.

The square root of 21151101 is about 4599.0326156704. The cubic root of 21151101 is about 276.5525451490.

Adding to 21151101 its reverse (10115112), we get a palindrome (31266213).

The spelling of 21151101 in words is "twenty-one million, one hundred fifty-one thousand, one hundred one".