101621021 has 2 divisors, whose sum is σ = 101621022. Its totient is φ = 101621020.

The previous prime is 101621011. The next prime is 101621029. The reversal of 101621021 is 120126101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91948921 + 9672100 = 9589^2 + 3110^2 .

It is a cyclic number.

It is not a de Polignac number, because 101621021 - 2⁶ = 101620957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101620987 and 101621005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101621029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50810510 + 50810511.

It is an arithmetic number, because the mean of its divisors is an integer number (50810511).

Almost surely, 2^101621021 is an apocalyptic number.

It is an amenable number.

101621021 is a deficient number, since it is larger than the sum of its proper divisors (1).

101621021 is an equidigital number, since it uses as much as digits as its factorization.

101621021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 101621021 is about 10080.7252219272. The cubic root of 101621021 is about 466.6534898207.

Adding to 101621021 its reverse (120126101), we get a palindrome (221747122).

The spelling of 101621021 in words is "one hundred one million, six hundred twenty-one thousand, twenty-one".