21914949 has 16 divisors (see below), whose sum is σ = 33459840. Its totient is φ = 12498240.

The previous prime is 21914947. The next prime is 21914969. The reversal of 21914949 is 94941912.

It is not a de Polignac number, because 21914949 - 2¹ = 21914947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21914947) 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, 19207 + ... + 20315.

It is an arithmetic number, because the mean of its divisors is an integer number (2091240).

Almost surely, 2^21914949 is an apocalyptic number.

It is an amenable number.

21914949 is a deficient number, since it is larger than the sum of its proper divisors (11544891).

21914949 is a wasteful number, since it uses less digits than its factorization.

21914949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060.

The product of its digits is 23328, while the sum is 39.

The square root of 21914949 is about 4681.3405131436. The cubic root of 21914949 is about 279.8423815277.

It can be divided in two parts, 2191 and 4949, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 21914949 in words is "twenty-one million, nine hundred fourteen thousand, nine hundred forty-nine".