21361754 has 8 divisors (see below), whose sum is σ = 32066400. Its totient is φ = 10672956.

The previous prime is 21361729. The next prime is 21361763. The reversal of 21361754 is 45716312.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347 + ... + 6545.

It is an arithmetic number, because the mean of its divisors is an integer number (4008300).

Almost surely, 2^21361754 is an apocalyptic number.

21361754 is a deficient number, since it is larger than the sum of its proper divisors (10704646).

21361754 is a wasteful number, since it uses less digits than its factorization.

21361754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7924.

The product of its digits is 5040, while the sum is 29.

The square root of 21361754 is about 4621.8777569295. The cubic root of 21361754 is about 277.4676162735.

The spelling of 21361754 in words is "twenty-one million, three hundred sixty-one thousand, seven hundred fifty-four".