201002012122021 has 6 divisors (see below), whose sum is σ = 220936095968966. Its totient is φ = 182729101929000.

The previous prime is 201002012122013. The next prime is 201002012122097. The reversal of 201002012122021 is 120221210200102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 172142403293025 + 28859608828996 = 13120305^2 + 5372114^2 .

It is not a de Polignac number, because 201002012122021 - 2³ = 201002012122013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201002012121986 and 201002012122004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201002018122021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 830586826830 + ... + 830586827071.

Almost surely, 2^{201002012122021} is an apocalyptic number.

It is an amenable number.

201002012122021 is a deficient number, since it is larger than the sum of its proper divisors (19934083846945).

201002012122021 is a wasteful number, since it uses less digits than its factorization.

201002012122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661173653923 (or 1661173653912 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 201002012122021 its reverse (120221210200102), we get a palindrome (321223222322123).

It can be divided in two parts, 20100201 and 2122021, that added together give a palindrome (22222222).

The spelling of 201002012122021 in words is "two hundred one trillion, two billion, twelve million, one hundred twenty-two thousand, twenty-one".