21077226 has 32 divisors (see below), whose sum is σ = 47044800. Its totient is φ = 6994800.

The previous prime is 21077201. The next prime is 21077257. The reversal of 21077226 is 62277012.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 21077226.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13801 + ... + 15251.

It is an arithmetic number, because the mean of its divisors is an integer number (1470150).

Almost surely, 2^21077226 is an apocalyptic number.

21077226 is an abundant number, since it is smaller than the sum of its proper divisors (25967574).

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

21077226 is a wasteful number, since it uses less digits than its factorization.

21077226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731 (or 1725 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 21077226 is about 4590.9940100157. The cubic root of 21077226 is about 276.2301954777.

The spelling of 21077226 in words is "twenty-one million, seventy-seven thousand, two hundred twenty-six".