221540070 has 32 divisors (see below), whose sum is σ = 535891968. Its totient is φ = 58611168.

The previous prime is 221540047. The next prime is 221540089. The reversal of 221540070 is 70045122.

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, 25264 + ... + 32883.

It is an arithmetic number, because the mean of its divisors is an integer number (16746624).

Almost surely, 2^221540070 is an apocalyptic number.

221540070 is an abundant number, since it is smaller than the sum of its proper divisors (314351898).

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

221540070 is a wasteful number, since it uses less digits than its factorization.

221540070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58284.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 221540070 is about 14884.2221832382. Note that the first 3 decimals coincide. The cubic root of 221540070 is about 605.0864525956.

Adding to 221540070 its reverse (70045122), we get a palindrome (291585192).

The spelling of 221540070 in words is "two hundred twenty-one million, five hundred forty thousand, seventy".