2542129921 has 16 divisors (see below), whose sum is σ = 2672828928. Its totient is φ = 2414649600.

The previous prime is 2542129913. The next prime is 2542129927. The reversal of 2542129921 is 1299212452.

It is a cyclic number.

It is not a de Polignac number, because 2542129921 - 2³ = 2542129913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2542129927) 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, 1120230 + ... + 1122496.

It is an arithmetic number, because the mean of its divisors is an integer number (167051808).

Almost surely, 2^2542129921 is an apocalyptic number.

It is an amenable number.

2542129921 is a deficient number, since it is larger than the sum of its proper divisors (130699007).

2542129921 is a wasteful number, since it uses less digits than its factorization.

2542129921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2952.

The product of its digits is 25920, while the sum is 37.

The square root of 2542129921 is about 50419.5390796068. The cubic root of 2542129921 is about 1364.7902589802.

The spelling of 2542129921 in words is "two billion, five hundred forty-two million, one hundred twenty-nine thousand, nine hundred twenty-one".