42355121520 has 80 divisors (see below), whose sum is σ = 131352164352. Its totient is φ = 11290287360.

The previous prime is 42355121509. The next prime is 42355121551. The reversal of 42355121520 is 2512155324.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×42355121520² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 605985 + ... + 672255.

Almost surely, 2^42355121520 is an apocalyptic number.

42355121520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42355121520 is an abundant number, since it is smaller than the sum of its proper divisors (88997042832).

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

42355121520 is a wasteful number, since it uses less digits than its factorization.

42355121520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68950 (or 68944 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 42355121520 its reverse (2512155324), we get a palindrome (44867276844).

The spelling of 42355121520 in words is "forty-two billion, three hundred fifty-five million, one hundred twenty-one thousand, five hundred twenty".