345512454221021 has 16 divisors (see below), whose sum is σ = 355150616760576. Its totient is φ = 335932405200000.

The previous prime is 345512454220993. The next prime is 345512454221029. The reversal of 345512454221021 is 120122454215543.

It is a cyclic number.

It is not a de Polignac number, because 345512454221021 - 2⁶ = 345512454220957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 345512454221021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345512454221029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59328671 + ... + 64891571.

It is an arithmetic number, because the mean of its divisors is an integer number (22196913547536).

Almost surely, 2^{345512454221021} is an apocalyptic number.

It is an amenable number.

345512454221021 is a deficient number, since it is larger than the sum of its proper divisors (9638162539555).

345512454221021 is a wasteful number, since it uses less digits than its factorization.

345512454221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5568124.

The product of its (nonzero) digits is 384000, while the sum is 41.

The spelling of 345512454221021 in words is "three hundred forty-five trillion, five hundred twelve billion, four hundred fifty-four million, two hundred twenty-one thousand, twenty-one".