21622801 has 2 divisors, whose sum is σ = 21622802. Its totient is φ = 21622800.

The previous prime is 21622771. The next prime is 21622813. The reversal of 21622801 is 10822612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15397776 + 6225025 = 3924^2 + 2495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21622801 is a prime.

It is not a weakly prime, because it can be changed into another prime (21622831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10811400 + 10811401.

It is an arithmetic number, because the mean of its divisors is an integer number (10811401).

Almost surely, 2^21622801 is an apocalyptic number.

It is an amenable number.

21622801 is a deficient number, since it is larger than the sum of its proper divisors (1).

21622801 is an equidigital number, since it uses as much as digits as its factorization.

21622801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 21622801 is about 4650.0323654788. The cubic root of 21622801 is about 278.5932889517.

The spelling of 21622801 in words is "twenty-one million, six hundred twenty-two thousand, eight hundred one".