21221533520103 has 16 divisors (see below), whose sum is σ = 32387555704320. Its totient is φ = 12107847776736.

The previous prime is 21221533520101. The next prime is 21221533520147. The reversal of 21221533520103 is 30102533512212.

It is not a de Polignac number, because 21221533520103 - 2¹ = 21221533520101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221533520101) 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, 780936348 + ... + 780963521.

It is an arithmetic number, because the mean of its divisors is an integer number (2024222231520).

Almost surely, 2^{21221533520103} is an apocalyptic number.

21221533520103 is a deficient number, since it is larger than the sum of its proper divisors (11166022184217).

21221533520103 is a wasteful number, since it uses less digits than its factorization.

21221533520103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561900526.

The product of its (nonzero) digits is 10800, while the sum is 30.

The spelling of 21221533520103 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred thirty-three million, five hundred twenty thousand, one hundred three".