21021241311 has 32 divisors (see below), whose sum is σ = 36419243520. Its totient is φ = 11732781312.

The previous prime is 21021241303. The next prime is 21021241331. The reversal of 21021241311 is 11314212012.

It is not a de Polignac number, because 21021241311 - 2³ = 21021241303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021241331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1285170 + ... + 1301423.

It is an arithmetic number, because the mean of its divisors is an integer number (1138101360).

Almost surely, 2^21021241311 is an apocalyptic number.

21021241311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21021241311 is a deficient number, since it is larger than the sum of its proper divisors (15398002209).

21021241311 is a wasteful number, since it uses less digits than its factorization.

21021241311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586652 (or 2586646 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21021241311 its reverse (11314212012), we get a palindrome (32335453323).

The spelling of 21021241311 in words is "twenty-one billion, twenty-one million, two hundred forty-one thousand, three hundred eleven".