253421634642 has 32 divisors (see below), whose sum is σ = 552940197120. Its totient is φ = 76791619920.

The previous prime is 253421634617. The next prime is 253421634667. The reversal of 253421634642 is 246436124352.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (253421634617) and next prime (253421634667).

It is a junction number, because it is equal to n+sod(n) for n = 253421634594 and 253421634603.

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, 2391393 + ... + 2495115.

It is an arithmetic number, because the mean of its divisors is an integer number (17279381160).

Almost surely, 2^253421634642 is an apocalyptic number.

253421634642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

253421634642 is an abundant number, since it is smaller than the sum of its proper divisors (299518562478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

253421634642 is a wasteful number, since it uses less digits than its factorization.

253421634642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140758.

The product of its digits is 829440, while the sum is 42.

Adding to 253421634642 its reverse (246436124352), we get a palindrome (499857758994).

The spelling of 253421634642 in words is "two hundred fifty-three billion, four hundred twenty-one million, six hundred thirty-four thousand, six hundred forty-two".