21623627 has 2 divisors, whose sum is σ = 21623628. Its totient is φ = 21623626.

The previous prime is 21623621. The next prime is 21623633. The reversal of 21623627 is 72632612.

It is a balanced prime because it is at equal distance from previous prime (21623621) and next prime (21623633).

It is a cyclic number.

It is not a de Polignac number, because 21623627 - 2¹² = 21619531 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21623627.

It is not a weakly prime, because it can be changed into another prime (21623621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10811813 + 10811814.

It is an arithmetic number, because the mean of its divisors is an integer number (10811814).

Almost surely, 2^21623627 is an apocalyptic number.

21623627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21623627 is an equidigital number, since it uses as much as digits as its factorization.

21623627 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 29.

The square root of 21623627 is about 4650.1211812167. The cubic root of 21623627 is about 278.5968363664.

The spelling of 21623627 in words is "twenty-one million, six hundred twenty-three thousand, six hundred twenty-seven".