215402521542 has 32 divisors (see below), whose sum is σ = 488361995520. Its totient is φ = 62789398560.

The previous prime is 215402521471. The next prime is 215402521577. The reversal of 215402521542 is 245125204512.

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, 72671434 + ... + 72674397.

It is an arithmetic number, because the mean of its divisors is an integer number (15261312360).

Almost surely, 2^215402521542 is an apocalyptic number.

215402521542 is an abundant number, since it is smaller than the sum of its proper divisors (272959473978).

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

215402521542 is a wasteful number, since it uses less digits than its factorization.

215402521542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145345868.

The product of its (nonzero) digits is 32000, while the sum is 33.

The spelling of 215402521542 in words is "two hundred fifteen billion, four hundred two million, five hundred twenty-one thousand, five hundred forty-two".