21441951 has 12 divisors (see below), whose sum is σ = 31050760. Its totient is φ = 14258160.

The previous prime is 21441941. The next prime is 21441967. The reversal of 21441951 is 15914412.

It is not a de Polignac number, because 21441951 - 2⁵ = 21441919 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 (21441941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 960 + ... + 6618.

Almost surely, 2^21441951 is an apocalyptic number.

21441951 is a deficient number, since it is larger than the sum of its proper divisors (9608809).

21441951 is a wasteful number, since it uses less digits than its factorization.

21441951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6086 (or 6083 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 21441951 is about 4630.5454322358. The cubic root of 21441951 is about 277.8144086744.

It can be divided in two parts, 2144 and 1951, that added together give a triangular number (4095 = T₉₀).

The spelling of 21441951 in words is "twenty-one million, four hundred forty-one thousand, nine hundred fifty-one".