21996453 has 16 divisors (see below), whose sum is σ = 32057856. Its totient is φ = 13355520.

The previous prime is 21996451. The next prime is 21996461. The reversal of 21996453 is 35469912.

It is not a de Polignac number, because 21996453 - 2¹ = 21996451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21996451) 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, 5376 + ... + 8537.

It is an arithmetic number, because the mean of its divisors is an integer number (2003616).

Almost surely, 2^21996453 is an apocalyptic number.

It is an amenable number.

21996453 is a deficient number, since it is larger than the sum of its proper divisors (10061403).

21996453 is a wasteful number, since it uses less digits than its factorization.

21996453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13964.

The product of its digits is 58320, while the sum is 39.

The square root of 21996453 is about 4690.0376331113. The cubic root of 21996453 is about 280.1888734175.

The spelling of 21996453 in words is "twenty-one million, nine hundred ninety-six thousand, four hundred fifty-three".