21477514 has 4 divisors (see below), whose sum is σ = 32216274. Its totient is φ = 10738756.

The previous prime is 21477509. The next prime is 21477517. The reversal of 21477514 is 41577412.

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., 17497489 + 3980025 = 4183^2 + 1995^2 .

It is a super-2 number, since 2×21477514² = 922567215240392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21477517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5369377 + ... + 5369380.

Almost surely, 2^21477514 is an apocalyptic number.

21477514 is a deficient number, since it is larger than the sum of its proper divisors (10738760).

21477514 is a wasteful number, since it uses less digits than its factorization.

21477514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10738759.

The product of its digits is 7840, while the sum is 31.

The square root of 21477514 is about 4634.3838856961. The cubic root of 21477514 is about 277.9679154870.

The spelling of 21477514 in words is "twenty-one million, four hundred seventy-seven thousand, five hundred fourteen".