21010102121123 has 2 divisors, whose sum is σ = 21010102121124. Its totient is φ = 21010102121122.

The previous prime is 21010102121059. The next prime is 21010102121147. The reversal of 21010102121123 is 32112120101012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21010102121123 - 2⁶ = 21010102121059 is a prime.

It is a super-2 number, since 2×21010102121123² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21010102121923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505051060561 + 10505051060562.

It is an arithmetic number, because the mean of its divisors is an integer number (10505051060562).

Almost surely, 2^{21010102121123} is an apocalyptic number.

21010102121123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010102121123 is an equidigital number, since it uses as much as digits as its factorization.

21010102121123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21010102121123 its reverse (32112120101012), we get a palindrome (53122222222135).

The spelling of 21010102121123 in words is "twenty-one trillion, ten billion, one hundred two million, one hundred twenty-one thousand, one hundred twenty-three".