21027154 has 4 divisors (see below), whose sum is σ = 31540734. Its totient is φ = 10513576.

The previous prime is 21027143. The next prime is 21027169. The reversal of 21027154 is 45172012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15000129 + 6027025 = 3873^2 + 2455^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5256787 + ... + 5256790.

Almost surely, 2^21027154 is an apocalyptic number.

21027154 is a deficient number, since it is larger than the sum of its proper divisors (10513580).

21027154 is a wasteful number, since it uses less digits than its factorization.

21027154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10513579.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 21027154 is about 4585.5374821279. The cubic root of 21027154 is about 276.0112804323.

Adding to 21027154 its reverse (45172012), we get a palindrome (66199166).

The spelling of 21027154 in words is "twenty-one million, twenty-seven thousand, one hundred fifty-four".