20021001011201 has 4 divisors (see below), whose sum is σ = 20040050489904. Its totient is φ = 20001951532500.

The previous prime is 20021001011087. The next prime is 20021001011303. The reversal of 20021001011201 is 10211010012002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20021001011201 - 2¹⁴ = 20021000994817 is a prime.

It is a super-2 number, since 2×20021001011201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021001811201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9524737775 + ... + 9524739876.

It is an arithmetic number, because the mean of its divisors is an integer number (5010012622476).

Almost surely, 2^{20021001011201} is an apocalyptic number.

It is an amenable number.

20021001011201 is a deficient number, since it is larger than the sum of its proper divisors (19049478703).

20021001011201 is a wasteful number, since it uses less digits than its factorization.

20021001011201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19049478702.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20021001011201 its reverse (10211010012002), we get a palindrome (30232011023203).

The spelling of 20021001011201 in words is "twenty trillion, twenty-one billion, one million, eleven thousand, two hundred one".