21369650 has 24 divisors (see below), whose sum is σ = 40347120. Its totient is φ = 8418960.

The previous prime is 21369617. The next prime is 21369659. The reversal of 21369650 is 5696312.

It is a happy number.

It is a super-2 number, since 2×21369650² = 913323882245000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21369659) 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, 161 + ... + 6539.

It is an arithmetic number, because the mean of its divisors is an integer number (1681130).

Almost surely, 2^21369650 is an apocalyptic number.

21369650 is a deficient number, since it is larger than the sum of its proper divisors (18977470).

21369650 is a wasteful number, since it uses less digits than its factorization.

21369650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6458 (or 6453 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 21369650 is about 4622.7318762827. The cubic root of 21369650 is about 277.5017990847.

The spelling of 21369650 in words is "twenty-one million, three hundred sixty-nine thousand, six hundred fifty".