21355410253770 has 320 divisors, whose sum is σ = 60882354238464. Its totient is φ = 5359945789440.

The previous prime is 21355410253763. The next prime is 21355410253817. The reversal of 21355410253770 is 7735201455312.

21355410253770 is a `hidden beast` number, since 2 + 1 + 3 + 5 + 5 + 4 + 102 + 537 + 7 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 586137474 + ... + 586173906.

Almost surely, 2^{21355410253770} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21355410253770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30441177119232).

21355410253770 is an abundant number, since it is smaller than the sum of its proper divisors (39526943984694).

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

21355410253770 is a wasteful number, since it uses less digits than its factorization.

21355410253770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36979 (or 36970 counting only the distinct ones).

The product of its (nonzero) digits is 882000, while the sum is 45.

The spelling of 21355410253770 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred ten million, two hundred fifty-three thousand, seven hundred seventy".