21490711 has 8 divisors (see below), whose sum is σ = 24253200. Its totient is φ = 18863040.

The previous prime is 21490709. The next prime is 21490739. The reversal of 21490711 is 11709412.

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

It is a cyclic number.

It is not a de Polignac number, because 21490711 - 2¹ = 21490709 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 (21499711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33366 + ... + 34003.

It is an arithmetic number, because the mean of its divisors is an integer number (3031650).

Almost surely, 2^21490711 is an apocalyptic number.

21490711 is a deficient number, since it is larger than the sum of its proper divisors (2762489).

21490711 is a wasteful number, since it uses less digits than its factorization.

21490711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67409.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 21490711 is about 4635.8074809034. The cubic root of 21490711 is about 278.0248369025.

It can be divided in two parts, 21490 and 711, that added together give a square (22201 = 149²).

The spelling of 21490711 in words is "twenty-one million, four hundred ninety thousand, seven hundred eleven".