221501135540402 has 16 divisors (see below), whose sum is σ = 341064680399520. Its totient is φ = 107829366214752.

The previous prime is 221501135540393. The next prime is 221501135540431. The reversal of 221501135540402 is 204045531105122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4114341452 + ... + 4114395287.

It is an arithmetic number, because the mean of its divisors is an integer number (21316542524970).

Almost surely, 2^{221501135540402} is an apocalyptic number.

221501135540402 is a deficient number, since it is larger than the sum of its proper divisors (119563544859118).

221501135540402 is a wasteful number, since it uses less digits than its factorization.

221501135540402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8228737097.

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 221501135540402 its reverse (204045531105122), we get a palindrome (425546666645524).

The spelling of 221501135540402 in words is "two hundred twenty-one trillion, five hundred one billion, one hundred thirty-five million, five hundred forty thousand, four hundred two".