21550701 has 32 divisors (see below), whose sum is σ = 31352832. Its totient is φ = 13133120.

The previous prime is 21550691. The next prime is 21550777. The reversal of 21550701 is 10705512.

It is a cyclic number.

It is not a de Polignac number, because 21550701 - 2⁶ = 21550637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 259606 + ... + 259688.

It is an arithmetic number, because the mean of its divisors is an integer number (979776).

Almost surely, 2^21550701 is an apocalyptic number.

It is an amenable number.

21550701 is a deficient number, since it is larger than the sum of its proper divisors (9802131).

21550701 is a wasteful number, since it uses less digits than its factorization.

21550701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 21550701 is about 4642.2732577908. The cubic root of 21550701 is about 278.2832929829.

The spelling of 21550701 in words is "twenty-one million, five hundred fifty thousand, seven hundred one".