21272350 has 24 divisors (see below), whose sum is σ = 43164648. Its totient is φ = 7735200.

The previous prime is 21272333. The next prime is 21272351. The reversal of 21272350 is 5327212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21272351) 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, 18789 + ... + 19888.

It is an arithmetic number, because the mean of its divisors is an integer number (1798527).

Almost surely, 2^21272350 is an apocalyptic number.

21272350 is an abundant number, since it is smaller than the sum of its proper divisors (21892298).

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

21272350 is a wasteful number, since it uses less digits than its factorization.

21272350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38700 (or 38695 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21272350 is about 4612.1957894261. The cubic root of 21272350 is about 277.0799857637.

Adding to 21272350 its reverse (5327212), we get a palindrome (26599562).

The spelling of 21272350 in words is "twenty-one million, two hundred seventy-two thousand, three hundred fifty".