51821067354 has 32 divisors (see below), whose sum is σ = 122269065216. Its totient is φ = 14328405360.

The previous prime is 51821067349. The next prime is 51821067383. The reversal of 51821067354 is 45376012815.

It is a happy number.

It is a super-2 number, since 2×51821067354² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 19899262 + ... + 19901865.

It is an arithmetic number, because the mean of its divisors is an integer number (3820908288).

Almost surely, 2^51821067354 is an apocalyptic number.

51821067354 is an abundant number, since it is smaller than the sum of its proper divisors (70447997862).

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

51821067354 is a wasteful number, since it uses less digits than its factorization.

51821067354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39801170.

The product of its (nonzero) digits is 201600, while the sum is 42.

The spelling of 51821067354 in words is "fifty-one billion, eight hundred twenty-one million, sixty-seven thousand, three hundred fifty-four".