21121001201021 has 8 divisors (see below), whose sum is σ = 22232703765600. Its totient is φ = 20009305728720.

The previous prime is 21121001200991. The next prime is 21121001201029. The reversal of 21121001201021 is 12010210012112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121001201021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121001200987 and 21121001201005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121001201029) 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, 5003951 + ... + 8202531.

It is an arithmetic number, because the mean of its divisors is an integer number (2779087970700).

Almost surely, 2^{21121001201021} is an apocalyptic number.

It is an amenable number.

21121001201021 is a deficient number, since it is larger than the sum of its proper divisors (1111702564579).

21121001201021 is a wasteful number, since it uses less digits than its factorization.

21121001201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3546139.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21121001201021 its reverse (12010210012112), we get a palindrome (33131211213133).

The spelling of 21121001201021 in words is "twenty-one trillion, one hundred twenty-one billion, one million, two hundred one thousand, twenty-one".