21211149 has 16 divisors (see below), whose sum is σ = 28929600. Its totient is φ = 13819776.

The previous prime is 21211139. The next prime is 21211181. The reversal of 21211149 is 94111212.

It is a happy number.

It is not a de Polignac number, because 21211149 - 2¹³ = 21202957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51657 + ... + 52065.

It is an arithmetic number, because the mean of its divisors is an integer number (1808100).

Almost surely, 2^21211149 is an apocalyptic number.

It is an amenable number.

21211149 is a deficient number, since it is larger than the sum of its proper divisors (7718451).

21211149 is a wasteful number, since it uses less digits than its factorization.

21211149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764.

The product of its digits is 144, while the sum is 21.

The square root of 21211149 is about 4605.5563181878. The cubic root of 21211149 is about 276.8140088706.

The spelling of 21211149 in words is "twenty-one million, two hundred eleven thousand, one hundred forty-nine".