21012011022021 has 8 divisors (see below), whose sum is σ = 28016139497760. Its totient is φ = 14007944947152.

The previous prime is 21012011022017. The next prime is 21012011022043. The reversal of 21012011022021 is 12022011021012.

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

It is not a de Polignac number, because 21012011022021 - 2² = 21012011022017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012011022091) 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, 14808786 + ... + 16165523.

It is an arithmetic number, because the mean of its divisors is an integer number (3502017437220).

Almost surely, 2^{21012011022021} is an apocalyptic number.

It is an amenable number.

21012011022021 is a deficient number, since it is larger than the sum of its proper divisors (7004128475739).

21012011022021 is a wasteful number, since it uses less digits than its factorization.

21012011022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31200435.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21012011022021 its reverse (12022011021012), we get a palindrome (33034022043033).

The spelling of 21012011022021 in words is "twenty-one trillion, twelve billion, eleven million, twenty-two thousand, twenty-one".