20120121021071 has 2 divisors, whose sum is σ = 20120121021072. Its totient is φ = 20120121021070.

The previous prime is 20120121021043. The next prime is 20120121021211. The reversal of 20120121021071 is 17012012102102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20120121021071 - 2²² = 20120116826767 is a prime.

It is a super-3 number, since 3×20120121021071³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120121023071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060060510535 + 10060060510536.

It is an arithmetic number, because the mean of its divisors is an integer number (10060060510536).

Almost surely, 2^{20120121021071} is an apocalyptic number.

20120121021071 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120121021071 is an equidigital number, since it uses as much as digits as its factorization.

20120121021071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 20120121021071 its reverse (17012012102102), we get a palindrome (37132133123173).

The spelling of 20120121021071 in words is "twenty trillion, one hundred twenty billion, one hundred twenty-one million, twenty-one thousand, seventy-one".