21219465 has 8 divisors (see below), whose sum is σ = 33951168. Its totient is φ = 11317040.

The previous prime is 21219449. The next prime is 21219481. The reversal of 21219465 is 56491212.

It is an interprime number because it is at equal distance from previous prime (21219449) and next prime (21219481).

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

It is not a de Polignac number, because 21219465 - 2⁴ = 21219449 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 707301 + ... + 707330.

It is an arithmetic number, because the mean of its divisors is an integer number (4243896).

Almost surely, 2^21219465 is an apocalyptic number.

It is an amenable number.

21219465 is a deficient number, since it is larger than the sum of its proper divisors (12731703).

21219465 is a wasteful number, since it uses less digits than its factorization.

21219465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414639.

The product of its digits is 4320, while the sum is 30.

The square root of 21219465 is about 4606.4590522439. The cubic root of 21219465 is about 276.8501798567.

The spelling of 21219465 in words is "twenty-one million, two hundred nineteen thousand, four hundred sixty-five".