21101077 has 4 divisors (see below), whose sum is σ = 22211680. Its totient is φ = 19990476.

The previous prime is 21101033. The next prime is 21101123. The reversal of 21101077 is 77010112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21101077 - 2⁷ = 21100949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1110583 = 21101077 / (2 + 1 + 1 + 0 + 1 + 0 + 7 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555273 + ... + 555310.

It is an arithmetic number, because the mean of its divisors is an integer number (5552920).

Almost surely, 2^21101077 is an apocalyptic number.

It is an amenable number.

21101077 is a deficient number, since it is larger than the sum of its proper divisors (1110603).

21101077 is a wasteful number, since it uses less digits than its factorization.

21101077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110602.

The product of its (nonzero) digits is 98, while the sum is 19.

The square root of 21101077 is about 4593.5908611891. The cubic root of 21101077 is about 276.3343502784.

Adding to 21101077 its reverse (77010112), we get a palindrome (98111189).

The spelling of 21101077 in words is "twenty-one million, one hundred one thousand, seventy-seven".