20020221011251 has 2 divisors, whose sum is σ = 20020221011252. Its totient is φ = 20020221011250.

The previous prime is 20020221011221. The next prime is 20020221011257. The reversal of 20020221011251 is 15211012202002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20020221011251 - 2¹³ = 20020221003059 is a prime.

It is not a weakly prime, because it can be changed into another prime (20020221011257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010110505625 + 10010110505626.

It is an arithmetic number, because the mean of its divisors is an integer number (10010110505626).

Almost surely, 2^{20020221011251} is an apocalyptic number.

20020221011251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020221011251 is an equidigital number, since it uses as much as digits as its factorization.

20020221011251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 20020221011251 its reverse (15211012202002), we get a palindrome (35231233213253).

The spelling of 20020221011251 in words is "twenty trillion, twenty billion, two hundred twenty-one million, eleven thousand, two hundred fifty-one".