21125353322029 has 4 divisors (see below), whose sum is σ = 23045839987680. Its totient is φ = 19204866656380.

The previous prime is 21125353321889. The next prime is 21125353322039. The reversal of 21125353322029 is 92022335352112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21125353322029 - 2³³ = 21116763387437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21125353321982 and 21125353322000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21125353322039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960243332809 + ... + 960243332830.

It is an arithmetic number, because the mean of its divisors is an integer number (5761459996920).

Almost surely, 2^{21125353322029} is an apocalyptic number.

It is an amenable number.

21125353322029 is a deficient number, since it is larger than the sum of its proper divisors (1920486665651).

21125353322029 is a wasteful number, since it uses less digits than its factorization.

21125353322029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920486665650.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 21125353322029 in words is "twenty-one trillion, one hundred twenty-five billion, three hundred fifty-three million, three hundred twenty-two thousand, twenty-nine".