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21101100073 is a prime number
BaseRepresentation
bin10011101001101110…
…010011110000101001
32000110120102221120221
4103221232103300221
5321203340200243
613405501450041
71344622251124
oct235156236051
960416387527
1021101100073
118a49025889
12410a870921
131cb3852241
14104262d3bb
1583776cbed
hex4e9b93c29

21101100073 has 2 divisors, whose sum is σ = 21101100074. Its totient is φ = 21101100072.

The previous prime is 21101100061. The next prime is 21101100109. The reversal of 21101100073 is 37000110112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12807901584 + 8293198489 = 113172^2 + 91067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21101100073 is a prime.

It is not a weakly prime, because it can be changed into another prime (21101100773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550550036 + 10550550037.

It is an arithmetic number, because the mean of its divisors is an integer number (10550550037).

Almost surely, 221101100073 is an apocalyptic number.

It is an amenable number.

21101100073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101100073 is an equidigital number, since it uses as much as digits as its factorization.

21101100073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42, while the sum is 16.

Adding to 21101100073 its reverse (37000110112), we get a palindrome (58101210185).

The spelling of 21101100073 in words is "twenty-one billion, one hundred one million, one hundred thousand, seventy-three".