42121512 has 64 divisors (see below), whose sum is σ = 123897600. Its totient is φ = 13213440.

The previous prime is 42121501. The next prime is 42121549. The reversal of 42121512 is 21512124.

It is a super-2 number, since 2×42121512² = 3548443546332288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 2064 + ... + 9407.

It is an arithmetic number, because the mean of its divisors is an integer number (1935900).

Almost surely, 2^42121512 is an apocalyptic number.

It is an amenable number.

42121512 is an abundant number, since it is smaller than the sum of its proper divisors (81776088).

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

42121512 is a wasteful number, since it uses less digits than its factorization.

42121512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11503 (or 11493 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 42121512 is about 6490.1087818310. The cubic root of 42121512 is about 347.9375631148.

Adding to 42121512 its reverse (21512124), we get a palindrome (63633636).

The spelling of 42121512 in words is "forty-two million, one hundred twenty-one thousand, five hundred twelve".