1521001022201 has 16 divisors (see below), whose sum is σ = 1610858092800. Its totient is φ = 1432147910400.

The previous prime is 1521001022143. The next prime is 1521001022231. The reversal of 1521001022201 is 1022201001251.

It is a cyclic number.

It is not a de Polignac number, because 1521001022201 - 2²⁶ = 1520933913337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1521001022201.

It is not an unprimeable number, because it can be changed into a prime (1521001022231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2004416 + ... + 2657006.

It is an arithmetic number, because the mean of its divisors is an integer number (100678630800).

Almost surely, 2^{1521001022201} is an apocalyptic number.

It is an amenable number.

1521001022201 is a deficient number, since it is larger than the sum of its proper divisors (89857070599).

1521001022201 is a wasteful number, since it uses less digits than its factorization.

1521001022201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653360.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 1521001022201 its reverse (1022201001251), we get a palindrome (2543202023452).

The spelling of 1521001022201 in words is "one trillion, five hundred twenty-one billion, one million, twenty-two thousand, two hundred one".