202120021020020 has 12 divisors (see below), whose sum is σ = 424452044142084. Its totient is φ = 80848008408000.

The previous prime is 202120021020017. The next prime is 202120021020067. The reversal of 202120021020020 is 20020120021202.

It can be written as a sum of positive squares in 2 ways, for example, as 43492494973456 + 158627526046564 = 6594884^2 + 12594742^2 .

It is a junction number, because it is equal to n+sod(n) for n = 202120021019977 and 202120021020004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5053000525481 + ... + 5053000525520.

It is an arithmetic number, because the mean of its divisors is an integer number (35371003678507).

Almost surely, 2^{202120021020020} is an apocalyptic number.

202120021020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202120021020020 is an abundant number, since it is smaller than the sum of its proper divisors (222332023122064).

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

202120021020020 is a wasteful number, since it uses less digits than its factorization.

202120021020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10106001051010 (or 10106001051008 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 202120021020020 its reverse (20020120021202), we get a palindrome (222140141041222).

The spelling of 202120021020020 in words is "two hundred two trillion, one hundred twenty billion, twenty-one million, twenty thousand, twenty".