21376755 has 24 divisors (see below), whose sum is σ = 37756368. Its totient is φ = 11184576.

The previous prime is 21376739. The next prime is 21376757. The reversal of 21376755 is 55767312.

It is not a de Polignac number, because 21376755 - 2⁴ = 21376739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21376757) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2097 + ... + 6866.

It is an arithmetic number, because the mean of its divisors is an integer number (1573182).

Almost surely, 2^21376755 is an apocalyptic number.

21376755 is a deficient number, since it is larger than the sum of its proper divisors (16379613).

21376755 is a wasteful number, since it uses less digits than its factorization.

21376755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9027 (or 9024 counting only the distinct ones).

The product of its digits is 44100, while the sum is 36.

The square root of 21376755 is about 4623.5002973937. The cubic root of 21376755 is about 277.5325503575.

The spelling of 21376755 in words is "twenty-one million, three hundred seventy-six thousand, seven hundred fifty-five".