20120221021111 has 2 divisors, whose sum is σ = 20120221021112. Its totient is φ = 20120221021110.

The previous prime is 20120221021063. The next prime is 20120221021129. The reversal of 20120221021111 is 11112012202102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20120221021111 - 2²⁹ = 20119684150199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120221021181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060110510555 + 10060110510556.

It is an arithmetic number, because the mean of its divisors is an integer number (10060110510556).

Almost surely, 2^{20120221021111} is an apocalyptic number.

20120221021111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120221021111 is an equidigital number, since it uses as much as digits as its factorization.

20120221021111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20120221021111 its reverse (11112012202102), we get a palindrome (31232233223213).

The spelling of 20120221021111 in words is "twenty trillion, one hundred twenty billion, two hundred twenty-one million, twenty-one thousand, one hundred eleven".