21371055 has 8 divisors (see below), whose sum is σ = 34193712. Its totient is φ = 11397888.

The previous prime is 21371047. The next prime is 21371069. The reversal of 21371055 is 55017312.

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

It is not a de Polignac number, because 21371055 - 2³ = 21371047 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712354 + ... + 712383.

It is an arithmetic number, because the mean of its divisors is an integer number (4274214).

Almost surely, 2^21371055 is an apocalyptic number.

21371055 is a deficient number, since it is larger than the sum of its proper divisors (12822657).

21371055 is a wasteful number, since it uses less digits than its factorization.

21371055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424745.

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 21371055 is about 4622.8838402019. The cubic root of 21371055 is about 277.5078806300.

Adding to 21371055 its reverse (55017312), we get a palindrome (76388367).

The spelling of 21371055 in words is "twenty-one million, three hundred seventy-one thousand, fifty-five".