215221420542 has 64 divisors (see below), whose sum is σ = 436675717440. Its totient is φ = 70711517184.

The previous prime is 215221420493. The next prime is 215221420543. The reversal of 215221420542 is 245024122512.

215221420542 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215221420543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63504184 + ... + 63507572.

It is an arithmetic number, because the mean of its divisors is an integer number (6823058085).

Almost surely, 2^215221420542 is an apocalyptic number.

215221420542 is an abundant number, since it is smaller than the sum of its proper divisors (221454296898).

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

215221420542 is a wasteful number, since it uses less digits than its factorization.

215221420542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4077.

The product of its (nonzero) digits is 12800, while the sum is 30.

The spelling of 215221420542 in words is "two hundred fifteen billion, two hundred twenty-one million, four hundred twenty thousand, five hundred forty-two".