21221023021029 has 24 divisors (see below), whose sum is σ = 33712830907392. Its totient is φ = 12781238084640.

The previous prime is 21221023021001. The next prime is 21221023021043. The reversal of 21221023021029 is 92012032012212.

21221023021029 is a `hidden beast` number, since 2 + 1 + 2 + 210 + 230 + 210 + 2 + 9 = 666.

It is not a de Polignac number, because 21221023021029 - 2¹³ = 21221023012837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221023020993 and 21221023021011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221023023029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1929529237 + ... + 1929540234.

It is an arithmetic number, because the mean of its divisors is an integer number (1404701287808).

Almost surely, 2^{21221023021029} is an apocalyptic number.

It is an amenable number.

21221023021029 is a deficient number, since it is larger than the sum of its proper divisors (12491807886363).

21221023021029 is a wasteful number, since it uses less digits than its factorization.

21221023021029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3859069537 (or 3859069534 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 21221023021029 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-three million, twenty-one thousand, twenty-nine".