202121021087 has 2 divisors, whose sum is σ = 202121021088. Its totient is φ = 202121021086.

The previous prime is 202121021071. The next prime is 202121021117. The reversal of 202121021087 is 780120121202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 202121021087 - 2⁴ = 202121021071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202121021027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060510543 + 101060510544.

It is an arithmetic number, because the mean of its divisors is an integer number (101060510544).

Almost surely, 2^202121021087 is an apocalyptic number.

202121021087 is a deficient number, since it is larger than the sum of its proper divisors (1).

202121021087 is an equidigital number, since it uses as much as digits as its factorization.

202121021087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 26.

Adding to 202121021087 its reverse (780120121202), we get a palindrome (982241142289).

The spelling of 202121021087 in words is "two hundred two billion, one hundred twenty-one million, twenty-one thousand, eighty-seven".