2021000121005 has 16 divisors (see below), whose sum is σ = 2513332015920. Its totient is φ = 1558245706752.

The previous prime is 2021000120987. The next prime is 2021000121031. The reversal of 2021000121005 is 5001210001202.

It can be written as a sum of positive squares in 8 ways, for example, as 233615622244 + 1787384498761 = 483338^2 + 1336931^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021000121005 - 2⁶ = 2021000120941 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12430844 + ... + 12592373.

It is an arithmetic number, because the mean of its divisors is an integer number (157083250995).

Almost surely, 2^{2021000121005} is an apocalyptic number.

It is an amenable number.

2021000121005 is a deficient number, since it is larger than the sum of its proper divisors (492331894915).

2021000121005 is a wasteful number, since it uses less digits than its factorization.

2021000121005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25023808.

The product of its (nonzero) digits is 40, while the sum is 14.

Adding to 2021000121005 its reverse (5001210001202), we get a palindrome (7022210122207).

The spelling of 2021000121005 in words is "two trillion, twenty-one billion, one hundred twenty-one thousand, five".