221432145351554 has 32 divisors (see below), whose sum is σ = 334123803256320. Its totient is φ = 110059752108672.

The previous prime is 221432145351539. The next prime is 221432145351587. The reversal of 221432145351554 is 455153541234122.

It is a junction number, because it is equal to n+sod(n) for n = 221432145351499 and 221432145351508.

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, 497699102 + ... + 498143814.

It is an arithmetic number, because the mean of its divisors is an integer number (10441368851760).

Almost surely, 2^{221432145351554} is an apocalyptic number.

221432145351554 is a deficient number, since it is larger than the sum of its proper divisors (112691657904766).

221432145351554 is a wasteful number, since it uses less digits than its factorization.

221432145351554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447194.

The product of its digits is 2880000, while the sum is 47.

Adding to 221432145351554 its reverse (455153541234122), we get a palindrome (676585686585676).

The spelling of 221432145351554 in words is "two hundred twenty-one trillion, four hundred thirty-two billion, one hundred forty-five million, three hundred fifty-one thousand, five hundred fifty-four".