20111221101010 has 96 divisors (see below), whose sum is σ = 39295359379008. Its totient is φ = 7407446941440.

The previous prime is 20111221101007. The next prime is 20111221101043. The reversal of 20111221101010 is 1010112211102.

It is a happy number.

It is a super-2 number, since 2×20111221101010² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3155688184 + ... + 3155694556.

It is an arithmetic number, because the mean of its divisors is an integer number (409326660198).

Almost surely, 2^{20111221101010} is an apocalyptic number.

20111221101010 is a deficient number, since it is larger than the sum of its proper divisors (19184138277998).

20111221101010 is a wasteful number, since it uses less digits than its factorization.

20111221101010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10700 (or 10687 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20111221101010 its reverse (1010112211102), we get a palindrome (21121333312112).

The spelling of 20111221101010 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-one million, one hundred one thousand, ten".