202121220210020 has 24 divisors (see below), whose sum is σ = 429223714831800. Its totient is φ = 79940078104832.

The previous prime is 202121220209957. The next prime is 202121220210059. The reversal of 202121220210020 is 20012022121202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 49235117367076 + 152886102842944 = 7016774^2 + 12364712^2 .

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, 56775621875 + ... + 56775625434.

It is an arithmetic number, because the mean of its divisors is an integer number (17884321451325).

Almost surely, 2^{202121220210020} is an apocalyptic number.

202121220210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121220210020 is an abundant number, since it is smaller than the sum of its proper divisors (227102494621780).

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

202121220210020 is a wasteful number, since it uses less digits than its factorization.

202121220210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113551247407 (or 113551247405 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 202121220210020 its reverse (20012022121202), we get a palindrome (222133242331222).

The spelling of 202121220210020 in words is "two hundred two trillion, one hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, twenty".