51421022100 has 576 divisors, whose sum is σ = 195107512320. Its totient is φ = 11374732800.

The previous prime is 51421022087. The next prime is 51421022113. The reversal of 51421022100 is 122012415.

It is an interprime number because it is at equal distance from previous prime (51421022087) and next prime (51421022113).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 95047830 + ... + 95048370.

It is an arithmetic number, because the mean of its divisors is an integer number (338728320).

Almost surely, 2^51421022100 is an apocalyptic number.

51421022100 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 51421022100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97553756160).

51421022100 is an abundant number, since it is smaller than the sum of its proper divisors (143686490220).

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

51421022100 is a wasteful number, since it uses less digits than its factorization.

51421022100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 712 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 51421022100 its reverse (122012415), we get a palindrome (51543034515).

The spelling of 51421022100 in words is "fifty-one billion, four hundred twenty-one million, twenty-two thousand, one hundred".