21001002213103 has 48 divisors (see below), whose sum is σ = 25218284283360. Its totient is φ = 17320246272000.

The previous prime is 21001002213101. The next prime is 21001002213143. The reversal of 21001002213103 is 30131220010012.

It is not a de Polignac number, because 21001002213103 - 2¹ = 21001002213101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001002213101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55217275 + ... + 55596307.

It is an arithmetic number, because the mean of its divisors is an integer number (525380922570).

Almost surely, 2^{21001002213103} is an apocalyptic number.

21001002213103 is a deficient number, since it is larger than the sum of its proper divisors (4217282070257).

21001002213103 is a wasteful number, since it uses less digits than its factorization.

21001002213103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379708 (or 379691 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21001002213103 its reverse (30131220010012), we get a palindrome (51132222223115).

The spelling of 21001002213103 in words is "twenty-one trillion, one billion, two million, two hundred thirteen thousand, one hundred three".