21119420 has 48 divisors (see below), whose sum is σ = 51538368. Its totient is φ = 7119360.

The previous prime is 21119419. The next prime is 21119471. The reversal of 21119420 is 2491112.

It is a super-2 number, since 2×21119420² = 892059802272800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21119392 and 21119401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7304 + ... + 9776.

It is an arithmetic number, because the mean of its divisors is an integer number (1073716).

Almost surely, 2^21119420 is an apocalyptic number.

21119420 is a gapful number since it is divisible by the number (20) 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 21119420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25769184).

21119420 is an abundant number, since it is smaller than the sum of its proper divisors (30418948).

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

21119420 is a wasteful number, since it uses less digits than its factorization.

21119420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550 (or 2548 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 21119420 is about 4595.5870136469. The cubic root of 21119420 is about 276.4143988455.

The spelling of 21119420 in words is "twenty-one million, one hundred nineteen thousand, four hundred twenty".