21077031 has 8 divisors (see below), whose sum is σ = 28154880. Its totient is φ = 14025272.

The previous prime is 21077027. The next prime is 21077051. The reversal of 21077031 is 13077012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21077031 - 2² = 21077027 is a prime.

It is a super-2 number, since 2×21077031² = 888482471549922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21076989 and 21077007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21077011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4551 + ... + 7928.

It is an arithmetic number, because the mean of its divisors is an integer number (3519360).

Almost surely, 2^21077031 is an apocalyptic number.

21077031 is a deficient number, since it is larger than the sum of its proper divisors (7077849).

21077031 is a wasteful number, since it uses less digits than its factorization.

21077031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13045.

The product of its (nonzero) digits is 294, while the sum is 21.

The square root of 21077031 is about 4590.9727727356. The cubic root of 21077031 is about 276.2293436095.

The spelling of 21077031 in words is "twenty-one million, seventy-seven thousand, thirty-one".