20210101209990 has 48 divisors (see below), whose sum is σ = 53407677310416. Its totient is φ = 5301010152000.

The previous prime is 20210101209989. The next prime is 20210101210001. The reversal of 20210101209990 is 9990210101202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1840623036 + ... + 1840634015.

It is an arithmetic number, because the mean of its divisors is an integer number (1112659943967).

Almost surely, 2^{20210101209990} is an apocalyptic number.

20210101209990 is an abundant number, since it is smaller than the sum of its proper divisors (33197576100426).

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

20210101209990 is a wasteful number, since it uses less digits than its factorization.

20210101209990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3681257125 (or 3681257122 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The spelling of 20210101209990 in words is "twenty trillion, two hundred ten billion, one hundred one million, two hundred nine thousand, nine hundred ninety".