21419290 has 8 divisors (see below), whose sum is σ = 38554740. Its totient is φ = 8567712.

The previous prime is 21419287. The next prime is 21419291. The reversal of 21419290 is 9291412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18429849 + 2989441 = 4293^2 + 1729^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21419291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1070955 + ... + 1070974.

Almost surely, 2^21419290 is an apocalyptic number.

21419290 is a deficient number, since it is larger than the sum of its proper divisors (17135450).

21419290 is a wasteful number, since it uses less digits than its factorization.

21419290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141936.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 21419290 is about 4628.0978814195. The cubic root of 21419290 is about 277.7165044703.

The spelling of 21419290 in words is "twenty-one million, four hundred nineteen thousand, two hundred ninety".