21221533511063 has 16 divisors (see below), whose sum is σ = 21739025510400. Its totient is φ = 20705140844640.

The previous prime is 21221533511021. The next prime is 21221533511071. The reversal of 21221533511063 is 36011533512212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21221533511063 - 2¹² = 21221533506967 is a prime.

It is a super-2 number, since 2×21221533511063² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221533511263) 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, 188026058 + ... + 188138888.

It is an arithmetic number, because the mean of its divisors is an integer number (1358689094400).

Almost surely, 2^{21221533511063} is an apocalyptic number.

21221533511063 is a deficient number, since it is larger than the sum of its proper divisors (517491999337).

21221533511063 is a wasteful number, since it uses less digits than its factorization.

21221533511063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117662.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 21221533511063 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred thirty-three million, five hundred eleven thousand, sixty-three".