20011202101987 has 16 divisors (see below), whose sum is σ = 21255940104192. Its totient is φ = 18773980456960.

The previous prime is 20011202101949. The next prime is 20011202102033. The reversal of 20011202101987 is 78910120211002.

It is a cyclic number.

It is not a de Polignac number, because 20011202101987 - 2¹⁵ = 20011202069219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011202161987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210085662 + ... + 210180892.

It is an arithmetic number, because the mean of its divisors is an integer number (1328496256512).

Almost surely, 2^{20011202101987} is an apocalyptic number.

20011202101987 is a deficient number, since it is larger than the sum of its proper divisors (1244738002205).

20011202101987 is a wasteful number, since it uses less digits than its factorization.

20011202101987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134558.

The product of its (nonzero) digits is 4032, while the sum is 34.

Adding to 20011202101987 its reverse (78910120211002), we get a palindrome (98921322312989).

The spelling of 20011202101987 in words is "twenty trillion, eleven billion, two hundred two million, one hundred one thousand, nine hundred eighty-seven".