2021000121631 has 2 divisors, whose sum is σ = 2021000121632. Its totient is φ = 2021000121630.

The previous prime is 2021000121617. The next prime is 2021000121689. The reversal of 2021000121631 is 1361210001202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021000121631 - 2⁵ = 2021000121599 is a prime.

It is a super-2 number, since 2×2021000121631² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2021000121599 and 2021000121608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021000121031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010500060815 + 1010500060816.

It is an arithmetic number, because the mean of its divisors is an integer number (1010500060816).

Almost surely, 2^{2021000121631} is an apocalyptic number.

2021000121631 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021000121631 is an equidigital number, since it uses as much as digits as its factorization.

2021000121631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2021000121631 its reverse (1361210001202), we get a palindrome (3382210122833).

The spelling of 2021000121631 in words is "two trillion, twenty-one billion, one hundred twenty-one thousand, six hundred thirty-one".