42721705420 has 12 divisors (see below), whose sum is σ = 89715581424. Its totient is φ = 17088682160.

The previous prime is 42721705391. The next prime is 42721705427. The reversal of 42721705420 is 2450712724.

It is a super-2 number, since 2×42721705420² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42721705427) 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, 1068042616 + ... + 1068042655.

It is an arithmetic number, because the mean of its divisors is an integer number (7476298452).

Almost surely, 2^42721705420 is an apocalyptic number.

It is an amenable number.

42721705420 is an abundant number, since it is smaller than the sum of its proper divisors (46993876004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42721705420 is a wasteful number, since it uses less digits than its factorization.

42721705420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136085280 (or 2136085278 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 34.

The spelling of 42721705420 in words is "forty-two billion, seven hundred twenty-one million, seven hundred five thousand, four hundred twenty".