21862429 has 2 divisors, whose sum is σ = 21862430. Its totient is φ = 21862428.

The previous prime is 21862417. The next prime is 21862441. The reversal of 21862429 is 92426812.

It is a balanced prime because it is at equal distance from previous prime (21862417) and next prime (21862441).

It can be written as a sum of positive squares in only one way, i.e., 20702500 + 1159929 = 4550^2 + 1077^2 .

It is a cyclic number.

It is not a de Polignac number, because 21862429 - 2¹¹ = 21860381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21862394 and 21862403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21862499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10931214 + 10931215.

It is an arithmetic number, because the mean of its divisors is an integer number (10931215).

Almost surely, 2^21862429 is an apocalyptic number.

It is an amenable number.

21862429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21862429 is an equidigital number, since it uses as much as digits as its factorization.

21862429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 21862429 is about 4675.7276439074. The cubic root of 21862429 is about 279.6186517739.

The spelling of 21862429 in words is "twenty-one million, eight hundred sixty-two thousand, four hundred twenty-nine".