20101210221001 has 16 divisors (see below), whose sum is σ = 24740155972224. Its totient is φ = 15904122499584.

The previous prime is 20101210220969. The next prime is 20101210221023. The reversal of 20101210221001 is 10012201210102.

It is a cyclic number.

It is not a de Polignac number, because 20101210221001 - 2⁵ = 20101210220969 is a prime.

It is a super-2 number, since 2×20101210221001² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (20101210221031) 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, 10975830 + ... + 12675616.

It is an arithmetic number, because the mean of its divisors is an integer number (1546259748264).

Almost surely, 2^{20101210221001} is an apocalyptic number.

It is an amenable number.

20101210221001 is a deficient number, since it is larger than the sum of its proper divisors (4638945751223).

20101210221001 is a wasteful number, since it uses less digits than its factorization.

20101210221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829760.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20101210221001 its reverse (10012201210102), we get a palindrome (30113411431103).

The spelling of 20101210221001 in words is "twenty trillion, one hundred one billion, two hundred ten million, two hundred twenty-one thousand, one".