21472115 has 16 divisors (see below), whose sum is σ = 29585088. Its totient is φ = 14654976.

The previous prime is 21472111. The next prime is 21472117. The reversal of 21472115 is 51127412.

It is not a de Polignac number, because 21472115 - 2² = 21472111 is a prime.

It is a super-2 number, since 2×21472115² = 922103445146450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21472111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6839 + ... + 9471.

It is an arithmetic number, because the mean of its divisors is an integer number (1849068).

Almost surely, 2^21472115 is an apocalyptic number.

21472115 is a deficient number, since it is larger than the sum of its proper divisors (8112973).

21472115 is a wasteful number, since it uses less digits than its factorization.

21472115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2878.

The product of its digits is 560, while the sum is 23.

The square root of 21472115 is about 4633.8013552590. The cubic root of 21472115 is about 277.9446217522.

Adding to 21472115 its reverse (51127412), we get a palindrome (72599527).

The spelling of 21472115 in words is "twenty-one million, four hundred seventy-two thousand, one hundred fifteen".