2021212355780 has 24 divisors (see below), whose sum is σ = 4245032460480. Its totient is φ = 808392273120.

The previous prime is 2021212355759. The next prime is 2021212355819. The reversal of 2021212355780 is 875532121202.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5612840 + ... + 5962079.

It is an arithmetic number, because the mean of its divisors is an integer number (176876352520).

Almost surely, 2^{2021212355780} is an apocalyptic number.

2021212355780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021212355780 is an abundant number, since it is smaller than the sum of its proper divisors (2223820104700).

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

2021212355780 is a wasteful number, since it uses less digits than its factorization.

2021212355780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11583659 (or 11583657 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 38.

Adding to 2021212355780 its reverse (875532121202), we get a palindrome (2896744476982).

The spelling of 2021212355780 in words is "two trillion, twenty-one billion, two hundred twelve million, three hundred fifty-five thousand, seven hundred eighty".