21022154 has 8 divisors (see below), whose sum is σ = 32550528. Its totient is φ = 10171980.

The previous prime is 21022117. The next prime is 21022163. The reversal of 21022154 is 45122012.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169472 + ... + 169595.

It is an arithmetic number, because the mean of its divisors is an integer number (4068816).

Almost surely, 2^21022154 is an apocalyptic number.

21022154 is a deficient number, since it is larger than the sum of its proper divisors (11528374).

21022154 is a wasteful number, since it uses less digits than its factorization.

21022154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339100.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21022154 is about 4584.9922573544. The cubic root of 21022154 is about 275.9894013293.

Adding to 21022154 its reverse (45122012), we get a palindrome (66144166).

The spelling of 21022154 in words is "twenty-one million, twenty-two thousand, one hundred fifty-four".