20111221210010 has 32 divisors (see below), whose sum is σ = 41384499875712. Its totient is φ = 6893135040960.

The previous prime is 20111221209907. The next prime is 20111221210013. The reversal of 20111221210010 is 1001212211102.

It is a super-2 number, since 2×20111221210010² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (20111221210013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44372972 + ... + 44823911.

It is an arithmetic number, because the mean of its divisors is an integer number (1293265621116).

Almost surely, 2^{20111221210010} is an apocalyptic number.

20111221210010 is an abundant number, since it is smaller than the sum of its proper divisors (21273278665702).

20111221210010 is a wasteful number, since it uses less digits than its factorization.

20111221210010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89200118.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20111221210010 its reverse (1001212211102), we get a palindrome (21112433421112).

The spelling of 20111221210010 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-one million, two hundred ten thousand, ten".