36401821820 has 48 divisors (see below), whose sum is σ = 94084713408. Its totient is φ = 11520576000.

The previous prime is 36401821801. The next prime is 36401821823. The reversal of 36401821820 is 2812810463.

It is a super-2 number, since 2×36401821820² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36401821823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9998681 + ... + 10002320.

It is an arithmetic number, because the mean of its divisors is an integer number (1960098196).

Almost surely, 2^36401821820 is an apocalyptic number.

It is an amenable number.

36401821820 is an abundant number, since it is smaller than the sum of its proper divisors (57682891588).

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

36401821820 is a wasteful number, since it uses less digits than its factorization.

36401821820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20001030 (or 20001028 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The spelling of 36401821820 in words is "thirty-six billion, four hundred one million, eight hundred twenty-one thousand, eight hundred twenty".