21601254 has 16 divisors (see below), whose sum is σ = 45744048. Its totient is φ = 6776832.

The previous prime is 21601189. The next prime is 21601277. The reversal of 21601254 is 45210612.

It is a super-2 number, since 2×21601254² = 933228348745032, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21601254.

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, 105787 + ... + 105990.

It is an arithmetic number, because the mean of its divisors is an integer number (2859003).

Almost surely, 2^21601254 is an apocalyptic number.

21601254 is an abundant number, since it is smaller than the sum of its proper divisors (24142794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21601254 is a wasteful number, since it uses less digits than its factorization.

21601254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211799.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21601254 is about 4647.7149224108. The cubic root of 21601254 is about 278.5007193128.

Adding to 21601254 its reverse (45210612), we get a palindrome (66811866).

The spelling of 21601254 in words is "twenty-one million, six hundred one thousand, two hundred fifty-four".