21471801 has 16 divisors (see below), whose sum is σ = 31120320. Its totient is φ = 13089600.

The previous prime is 21471787. The next prime is 21471839. The reversal of 21471801 is 10817412.

It is not a de Polignac number, because 21471801 - 2¹³ = 21463609 is a prime.

It is a super-2 number, since 2×21471801² = 922076476367202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21471301) 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, 1726 + ... + 6776.

It is an arithmetic number, because the mean of its divisors is an integer number (1945020).

Almost surely, 2^21471801 is an apocalyptic number.

It is an amenable number.

21471801 is a deficient number, since it is larger than the sum of its proper divisors (9648519).

21471801 is a wasteful number, since it uses less digits than its factorization.

21471801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5176.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 21471801 is about 4633.7674736655. The cubic root of 21471801 is about 277.9432668937.

The spelling of 21471801 in words is "twenty-one million, four hundred seventy-one thousand, eight hundred one".