21010021211101 has 16 divisors (see below), whose sum is σ = 24004756871424. Its totient is φ = 18216761635584.

The previous prime is 21010021211089. The next prime is 21010021211143. The reversal of 21010021211101 is 10111212001012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21010021211101 - 2¹³ = 21010021202909 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010021211801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94389801 + ... + 94612126.

It is an arithmetic number, because the mean of its divisors is an integer number (1500297304464).

Almost surely, 2^{21010021211101} is an apocalyptic number.

It is an amenable number.

21010021211101 is a deficient number, since it is larger than the sum of its proper divisors (2994735660323).

21010021211101 is a wasteful number, since it uses less digits than its factorization.

21010021211101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189002460.

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

Adding to 21010021211101 its reverse (10111212001012), we get a palindrome (31121233212113).

The spelling of 21010021211101 in words is "twenty-one trillion, ten billion, twenty-one million, two hundred eleven thousand, one hundred one".