20111121010 has 16 divisors (see below), whose sum is σ = 36558435672. Its totient is φ = 7964800000.

The previous prime is 20111121001. The next prime is 20111121013. The reversal of 20111121010 is 1012111102.

It can be written as a sum of positive squares in 4 ways, for example, as 16096758129 + 4014362881 = 126873^2 + 63359^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (20111121013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9954991 + ... + 9957010.

Almost surely, 2^20111121010 is an apocalyptic number.

20111121010 is a deficient number, since it is larger than the sum of its proper divisors (16447314662).

20111121010 is a wasteful number, since it uses less digits than its factorization.

20111121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19912109.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20111121010 its reverse (1012111102), we get a palindrome (21123232112).

The spelling of 20111121010 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, ten".