20111211101010 has 64 divisors (see below), whose sum is σ = 50809030312320. Its totient is φ = 5080550999040.

The previous prime is 20111211100993. The next prime is 20111211101039. The reversal of 20111211101010 is 1010111211102.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16264794 + ... + 17457546.

It is an arithmetic number, because the mean of its divisors is an integer number (793891098630).

Almost surely, 2^{20111211101010} is an apocalyptic number.

20111211101010 is an abundant number, since it is smaller than the sum of its proper divisors (30697819211310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111211101010 is a wasteful number, since it uses less digits than its factorization.

20111211101010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222363.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 20111211101010 its reverse (1010111211102), we get a palindrome (21121322312112).

The spelling of 20111211101010 in words is "twenty trillion, one hundred eleven billion, two hundred eleven million, one hundred one thousand, ten".