51221213454000 has 160 divisors (see below), whose sum is σ = 165229637054976. Its totient is φ = 13651343865600.

The previous prime is 51221213453987. The next prime is 51221213454067. The reversal of 51221213454000 is 45431212215.

It is a super-2 number, since 2×51221213454000² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8333397 + ... + 13110603.

Almost surely, 2^{51221213454000} is an apocalyptic number.

51221213454000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51221213454000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82614818527488).

51221213454000 is an abundant number, since it is smaller than the sum of its proper divisors (114008423600976).

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

51221213454000 is a wasteful number, since it uses less digits than its factorization.

51221213454000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4779020 (or 4779004 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 51221213454000 its reverse (45431212215), we get a palindrome (51266644666215).

The spelling of 51221213454000 in words is "fifty-one trillion, two hundred twenty-one billion, two hundred thirteen million, four hundred fifty-four thousand".