21020121001011 has 64 divisors (see below), whose sum is σ = 31015650580992. Its totient is φ = 12557001600000.

The previous prime is 21020121000979. The next prime is 21020121001013. The reversal of 21020121001011 is 11010012102012.

It is not a de Polignac number, because 21020121001011 - 2⁵ = 21020121000979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020121001013) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 689372476 + ... + 689402966.

It is an arithmetic number, because the mean of its divisors is an integer number (484619540328).

Almost surely, 2^{21020121001011} is an apocalyptic number.

21020121001011 is a deficient number, since it is larger than the sum of its proper divisors (9995529579981).

21020121001011 is a wasteful number, since it uses less digits than its factorization.

21020121001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31524.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21020121001011 its reverse (11010012102012), we get a palindrome (32030133103023).

It can be divided in two parts, 210201 and 21001011, that added together give a palindrome (21211212).

The spelling of 21020121001011 in words is "twenty-one trillion, twenty billion, one hundred twenty-one million, one thousand, eleven".