21369006 has 12 divisors (see below), whose sum is σ = 46299552. Its totient is φ = 7122996.

The previous prime is 21368999. The next prime is 21369011. The reversal of 21369006 is 60096312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 593566 + ... + 593601.

It is an arithmetic number, because the mean of its divisors is an integer number (3858296).

Almost surely, 2^21369006 is an apocalyptic number.

21369006 is an abundant number, since it is smaller than the sum of its proper divisors (24930546).

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

21369006 is a wasteful number, since it uses less digits than its factorization.

21369006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187175 (or 1187172 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 21369006 is about 4622.6622199767. The cubic root of 21369006 is about 277.4990114404.

The spelling of 21369006 in words is "twenty-one million, three hundred sixty-nine thousand, six".