21220120202001 has 8 divisors (see below), whose sum is σ = 32335421260224. Its totient is φ = 12125782972560.

The previous prime is 21220120201997. The next prime is 21220120202003. The reversal of 21220120202001 is 10020202102212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21220120202001 - 2² = 21220120201997 is a prime.

It is a super-2 number, since 2×21220120202001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21220120202003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505240957170 + ... + 505240957211.

It is an arithmetic number, because the mean of its divisors is an integer number (4041927657528).

Almost surely, 2^{21220120202001} is an apocalyptic number.

21220120202001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21220120202001 is a deficient number, since it is larger than the sum of its proper divisors (11115301058223).

21220120202001 is a wasteful number, since it uses less digits than its factorization.

21220120202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010481914391.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21220120202001 its reverse (10020202102212), we get a palindrome (31240322304213).

The spelling of 21220120202001 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty million, two hundred two thousand, one".