201001001021 has 32 divisors (see below), whose sum is σ = 209587419648. Its totient is φ = 192649766400.

The previous prime is 201001000939. The next prime is 201001001023. The reversal of 201001001021 is 120100100102.

It is not a de Polignac number, because 201001001021 - 2¹⁸ = 201000738877 is a prime.

It is a super-2 number, since 2×201001001021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201001001023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210913481 + ... + 210914433.

It is an arithmetic number, because the mean of its divisors is an integer number (6549606864).

Almost surely, 2^201001001021 is an apocalyptic number.

It is an amenable number.

201001001021 is a deficient number, since it is larger than the sum of its proper divisors (8586418627).

201001001021 is a wasteful number, since it uses less digits than its factorization.

201001001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 201001001021 its reverse (120100100102), we get a palindrome (321101101123).

The spelling of 201001001021 in words is "two hundred one billion, one million, one thousand, twenty-one".