21477071 has 16 divisors (see below), whose sum is σ = 27433728. Its totient is φ = 16324800.

The previous prime is 21477041. The next prime is 21477077. The reversal of 21477071 is 17077412.

It is a cyclic number.

It is not a de Polignac number, because 21477071 - 2⁶ = 21477007 is a prime.

It is a super-2 number, since 2×21477071² = 922529157478082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21477077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245 + ... + 6558.

It is an arithmetic number, because the mean of its divisors is an integer number (1714608).

Almost surely, 2^21477071 is an apocalyptic number.

21477071 is a deficient number, since it is larger than the sum of its proper divisors (5956657).

21477071 is a wasteful number, since it uses less digits than its factorization.

21477071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6862.

The product of its (nonzero) digits is 2744, while the sum is 29.

The square root of 21477071 is about 4634.3360905312. The cubic root of 21477071 is about 277.9660043311.

The spelling of 21477071 in words is "twenty-one million, four hundred seventy-seven thousand, seventy-one".