21472741 has 2 divisors, whose sum is σ = 21472742. Its totient is φ = 21472740.

The previous prime is 21472729. The next prime is 21472747. The reversal of 21472741 is 14727412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12047841 + 9424900 = 3471^2 + 3070^2 .

It is a cyclic number.

It is not a de Polignac number, because 21472741 - 2¹³ = 21464549 is a prime.

It is a super-2 number, since 2×21472741² = 922157212106162, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21472747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10736370 + 10736371.

It is an arithmetic number, because the mean of its divisors is an integer number (10736371).

Almost surely, 2^21472741 is an apocalyptic number.

It is an amenable number.

21472741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21472741 is an equidigital number, since it uses as much as digits as its factorization.

21472741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3136, while the sum is 28.

The square root of 21472741 is about 4633.8689019004. The cubic root of 21472741 is about 277.9473228003.

The spelling of 21472741 in words is "twenty-one million, four hundred seventy-two thousand, seven hundred forty-one".