21337020 has 60 divisors (see below), whose sum is σ = 66940104. Its totient is φ = 5689440.

The previous prime is 21337003. The next prime is 21337037. The reversal of 21337020 is 2073312.

It is an interprime number because it is at equal distance from previous prime (21337003) and next prime (21337037).

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21336984 and 21337002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4966 + ... + 8205.

Almost surely, 2^21337020 is an apocalyptic number.

21337020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21337020 is an abundant number, since it is smaller than the sum of its proper divisors (45603084).

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

21337020 is a wasteful number, since it uses less digits than its factorization.

21337020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13192 (or 13181 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 21337020 is about 4619.2012296500. The cubic root of 21337020 is about 277.3604850194.

The spelling of 21337020 in words is "twenty-one million, three hundred thirty-seven thousand, twenty".