21734501 has 2 divisors, whose sum is σ = 21734502. Its totient is φ = 21734500.

The previous prime is 21734467. The next prime is 21734519. The reversal of 21734501 is 10543712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12285025 + 9449476 = 3505^2 + 3074^2 .

It is a cyclic number.

It is not a de Polignac number, because 21734501 - 2⁶ = 21734437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21734201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10867250 + 10867251.

It is an arithmetic number, because the mean of its divisors is an integer number (10867251).

Almost surely, 2^21734501 is an apocalyptic number.

It is an amenable number.

21734501 is a deficient number, since it is larger than the sum of its proper divisors (1).

21734501 is an equidigital number, since it uses as much as digits as its factorization.

21734501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21734501 is about 4662.0275631961. The cubic root of 21734501 is about 279.0721883407.

The spelling of 21734501 in words is "twenty-one million, seven hundred thirty-four thousand, five hundred one".