140102021645 has 4 divisors (see below), whose sum is σ = 168122425980. Its totient is φ = 112081617312.

The previous prime is 140102021627. The next prime is 140102021737. The reversal of 140102021645 is 546120201041.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33292016521 + 106810005124 = 182461^2 + 326818^2 .

It is a cyclic number.

It is not a de Polignac number, because 140102021645 - 2²² = 140097827341 is a prime.

It is a super-3 number, since 3×140102021645³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14010202160 + ... + 14010202169.

It is an arithmetic number, because the mean of its divisors is an integer number (42030606495).

Almost surely, 2^140102021645 is an apocalyptic number.

It is an amenable number.

140102021645 is a deficient number, since it is larger than the sum of its proper divisors (28020404335).

140102021645 is an equidigital number, since it uses as much as digits as its factorization.

140102021645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28020404334.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 140102021645 its reverse (546120201041), we get a palindrome (686222222686).

The spelling of 140102021645 in words is "one hundred forty billion, one hundred two million, twenty-one thousand, six hundred forty-five".