21250788 has 24 divisors (see below), whose sum is σ = 53399808. Its totient is φ = 6538656.

The previous prime is 21250787. The next prime is 21250793. The reversal of 21250788 is 88705212.

It is not an unprimeable number, because it can be changed into a prime (21250787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67956 + ... + 68267.

It is an arithmetic number, because the mean of its divisors is an integer number (2224992).

Almost surely, 2^21250788 is an apocalyptic number.

It is an amenable number.

21250788 is an abundant number, since it is smaller than the sum of its proper divisors (32149020).

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

21250788 is a wasteful number, since it uses less digits than its factorization.

21250788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136243 (or 136241 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 21250788 is about 4609.8576984545. The cubic root of 21250788 is about 276.9863365214.

The spelling of 21250788 in words is "twenty-one million, two hundred fifty thousand, seven hundred eighty-eight".