21860273 has 2 divisors, whose sum is σ = 21860274. Its totient is φ = 21860272.

The previous prime is 21860263. The next prime is 21860323. The reversal of 21860273 is 37206812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20178064 + 1682209 = 4492^2 + 1297^2 .

It is a cyclic number.

It is not a de Polignac number, because 21860273 - 2¹⁰ = 21859249 is a prime.

It is not a weakly prime, because it can be changed into another prime (21860243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10930136 + 10930137.

It is an arithmetic number, because the mean of its divisors is an integer number (10930137).

Almost surely, 2^21860273 is an apocalyptic number.

It is an amenable number.

21860273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21860273 is an equidigital number, since it uses as much as digits as its factorization.

21860273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21860273 is about 4675.4970858723. The cubic root of 21860273 is about 279.6094597847.

The spelling of 21860273 in words is "twenty-one million, eight hundred sixty thousand, two hundred seventy-three".