21121021201031 has 2 divisors, whose sum is σ = 21121021201032. Its totient is φ = 21121021201030.

The previous prime is 21121021200973. The next prime is 21121021201039. The reversal of 21121021201031 is 13010212012112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121021201031 is a prime.

It is a super-2 number, since 2×21121021201031² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121021201039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560510600515 + 10560510600516.

It is an arithmetic number, because the mean of its divisors is an integer number (10560510600516).

Almost surely, 2^{21121021201031} is an apocalyptic number.

21121021201031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121021201031 is an equidigital number, since it uses as much as digits as its factorization.

21121021201031 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 21121021201031 its reverse (13010212012112), we get a palindrome (34131233213143).

It can be divided in two parts, 2112102 and 1201031, that added together give a palindrome (3313133).

The spelling of 21121021201031 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, two hundred one thousand, thirty-one".