21361077 has 40 divisors (see below), whose sum is σ = 33825792. Its totient is φ = 13413600.

The previous prime is 21361063. The next prime is 21361079. The reversal of 21361077 is 77016312.

It is not a de Polignac number, because 21361077 - 2⁶ = 21361013 is a prime.

It is a super-2 number, since 2×21361077² = 912591221199858, which contains 22 as substring.

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 21361077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361079) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 117927 + ... + 118107.

Almost surely, 2^21361077 is an apocalyptic number.

21361077 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21361077 is a deficient number, since it is larger than the sum of its proper divisors (12464715).

21361077 is a wasteful number, since it uses less digits than its factorization.

21361077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 21361077 is about 4621.8045177182. The cubic root of 21361077 is about 277.4646850604.

Adding to 21361077 its reverse (77016312), we get a palindrome (98377389).

The spelling of 21361077 in words is "twenty-one million, three hundred sixty-one thousand, seventy-seven".