21011274 has 12 divisors (see below), whose sum is σ = 45524466. Its totient is φ = 7003752.

The previous prime is 21011251. The next prime is 21011293. The reversal of 21011274 is 47211012.

It can be written as a sum of positive squares in only one way, i.e., 20766249 + 245025 = 4557^2 + 495^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1167293 = 21011274 / (2 + 1 + 0 + 1 + 1 + 2 + 7 + 4).

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, 583629 + ... + 583664.

Almost surely, 2^21011274 is an apocalyptic number.

21011274 is an abundant number, since it is smaller than the sum of its proper divisors (24513192).

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

21011274 is a wasteful number, since it uses less digits than its factorization.

21011274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167301 (or 1167298 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 21011274 is about 4583.8056241512. The cubic root of 21011274 is about 275.9417804106.

Adding to 21011274 its reverse (47211012), we get a palindrome (68222286).

It can be divided in two parts, 2101 and 1274, that added together give a cube (3375 = 15³).

The spelling of 21011274 in words is "twenty-one million, eleven thousand, two hundred seventy-four".