21370468 has 36 divisors (see below), whose sum is σ = 43953840. Its totient is φ = 9064272.

The previous prime is 21370463. The next prime is 21370483. The reversal of 21370468 is 86407312.

It is not an unprimeable number, because it can be changed into a prime (21370463) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20463 + ... + 21481.

It is an arithmetic number, because the mean of its divisors is an integer number (1220940).

Almost surely, 2^21370468 is an apocalyptic number.

21370468 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21370468, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21976920).

21370468 is an abundant number, since it is smaller than the sum of its proper divisors (22583372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21370468 is a wasteful number, since it uses less digits than its factorization.

21370468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144 (or 1135 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21370468 is about 4622.8203512574. The cubic root of 21370468 is about 277.5053398318.

The spelling of 21370468 in words is "twenty-one million, three hundred seventy thousand, four hundred sixty-eight".