21437753106 has 256 divisors, whose sum is σ = 57224724480. Its totient is φ = 5190324480.

The previous prime is 21437753089. The next prime is 21437753119. The reversal of 21437753106 is 60135773412.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 96133311 + ... + 96133533.

It is an arithmetic number, because the mean of its divisors is an integer number (223534080).

Almost surely, 2^21437753106 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21437753106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28612362240).

21437753106 is an abundant number, since it is smaller than the sum of its proper divisors (35786971374).

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

21437753106 is a wasteful number, since it uses less digits than its factorization.

21437753106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461.

The product of its (nonzero) digits is 105840, while the sum is 39.

The spelling of 21437753106 in words is "twenty-one billion, four hundred thirty-seven million, seven hundred fifty-three thousand, one hundred six".