20125435121 has 8 divisors (see below), whose sum is σ = 22038502464. Its totient is φ = 18226281520.

The previous prime is 20125435103. The next prime is 20125435129. The reversal of 20125435121 is 12153452102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20125435121 - 2²⁶ = 20058326257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20125435129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3475406 + ... + 3481191.

It is an arithmetic number, because the mean of its divisors is an integer number (2754812808).

Almost surely, 2^20125435121 is an apocalyptic number.

It is an amenable number.

20125435121 is a deficient number, since it is larger than the sum of its proper divisors (1913067343).

20125435121 is a wasteful number, since it uses less digits than its factorization.

20125435121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6956871.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 20125435121 its reverse (12153452102), we get a palindrome (32278887223).

The spelling of 20125435121 in words is "twenty billion, one hundred twenty-five million, four hundred thirty-five thousand, one hundred twenty-one".