146138876221 has 4 divisors (see below), whose sum is σ = 157380328252. Its totient is φ = 134897424192.

The previous prime is 146138876171. The next prime is 146138876227. The reversal of 146138876221 is 122678831641.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122678831641 = 335519 ⋅365639.

It can be written as a sum of positive squares in 2 ways, for example, as 63991291225 + 82147584996 = 252965^2 + 286614^2 .

It is a cyclic number.

It is not a de Polignac number, because 146138876221 - 2²⁹ = 145602005309 is a prime.

It is a super-2 number, since 2×146138876221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146138876227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5620725996 + ... + 5620726021.

It is an arithmetic number, because the mean of its divisors is an integer number (39345082063).

Almost surely, 2^146138876221 is an apocalyptic number.

It is an amenable number.

146138876221 is a deficient number, since it is larger than the sum of its proper divisors (11241452031).

146138876221 is a wasteful number, since it uses less digits than its factorization.

146138876221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11241452030.

The product of its digits is 774144, while the sum is 49.

The spelling of 146138876221 in words is "one hundred forty-six billion, one hundred thirty-eight million, eight hundred seventy-six thousand, two hundred twenty-one".