21021001022011 has 16 divisors (see below), whose sum is σ = 22316512694400. Its totient is φ = 19732073149440.

The previous prime is 21021001021987. The next prime is 21021001022069. The reversal of 21021001022011 is 11022010012012.

It is a cyclic number.

It is not a de Polignac number, because 21021001022011 - 2¹⁹ = 21021000497723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021001021982 and 21021001022000.

It is not an unprimeable number, because it can be changed into a prime (21021001022081) 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, 21869545 + ... + 22810501.

It is an arithmetic number, because the mean of its divisors is an integer number (1394782043400).

Almost surely, 2^{21021001022011} is an apocalyptic number.

21021001022011 is a deficient number, since it is larger than the sum of its proper divisors (1295511672389).

21021001022011 is a wasteful number, since it uses less digits than its factorization.

21021001022011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944454.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21021001022011 its reverse (11022010012012), we get a palindrome (32043011034023).

The spelling of 21021001022011 in words is "twenty-one trillion, twenty-one billion, one million, twenty-two thousand, eleven".