21021010022001 has 16 divisors (see below), whose sum is σ = 31226568081408. Its totient is φ = 12468942114000.

The previous prime is 21021010021993. The next prime is 21021010022011. The reversal of 21021010022001 is 10022001012012.

It is not a de Polignac number, because 21021010022001 - 2³ = 21021010021993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021010022011) 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, 6776597425 + ... + 6776600526.

It is an arithmetic number, because the mean of its divisors is an integer number (1951660505088).

Almost surely, 2^{21021010022001} is an apocalyptic number.

It is an amenable number.

21021010022001 is a deficient number, since it is larger than the sum of its proper divisors (10205558059407).

21021010022001 is a wasteful number, since it uses less digits than its factorization.

21021010022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13553198012.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21021010022001 its reverse (10022001012012), we get a palindrome (31043011034013).

The spelling of 21021010022001 in words is "twenty-one trillion, twenty-one billion, ten million, twenty-two thousand, one".