20121546542 has 8 divisors (see below), whose sum is σ = 30183133032. Its totient is φ = 10060502200.

The previous prime is 20121546541. The next prime is 20121546553. The reversal of 20121546542 is 24564512102.

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

It is a junction number, because it is equal to n+sod(n) for n = 20121546499 and 20121546508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121546541) 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, 24584 + ... + 202107.

It is an arithmetic number, because the mean of its divisors is an integer number (3772891629).

Almost surely, 2^20121546542 is an apocalyptic number.

20121546542 is a deficient number, since it is larger than the sum of its proper divisors (10061586490).

20121546542 is a wasteful number, since it uses less digits than its factorization.

20121546542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271074.

The product of its (nonzero) digits is 19200, while the sum is 32.

The spelling of 20121546542 in words is "twenty billion, one hundred twenty-one million, five hundred forty-six thousand, five hundred forty-two".