21012011021011 has 8 divisors (see below), whose sum is σ = 21047967438464. Its totient is φ = 20976068655360.

The previous prime is 21012011020993. The next prime is 21012011021021. The reversal of 21012011021011 is 11012011021012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21012011021011 - 2⁷ = 21012011020883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012011020982 and 21012011021000.

It is not an unprimeable number, because it can be changed into a prime (21012011021021) 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, 517560 + ... + 6503221.

It is an arithmetic number, because the mean of its divisors is an integer number (2630995929808).

Almost surely, 2^{21012011021011} is an apocalyptic number.

21012011021011 is a deficient number, since it is larger than the sum of its proper divisors (35956417453).

21012011021011 is an equidigital number, since it uses as much as digits as its factorization.

21012011021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7025901.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21012011021011 its reverse (11012011021012), we get a palindrome (32024022042023).

Subtracting from 21012011021011 its reverse (11012011021012), we obtain a palindrome (9999999999999).

The spelling of 21012011021011 in words is "twenty-one trillion, twelve billion, eleven million, twenty-one thousand, eleven".