21021120101121 has 32 divisors (see below), whose sum is σ = 33425229754368. Its totient is φ = 11489686824000.

The previous prime is 21021120101081. The next prime is 21021120101131. The reversal of 21021120101121 is 12110102112012.

It is a happy number.

It is not a de Polignac number, because 21021120101121 - 2⁶ = 21021120101057 is a prime.

It is a super-2 number, since 2×21021120101121² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21021120101121.

It is not an unprimeable number, because it can be changed into a prime (21021120101131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69159340 + ... + 69462626.

It is an arithmetic number, because the mean of its divisors is an integer number (1044538429824).

Almost surely, 2^{21021120101121} is an apocalyptic number.

21021120101121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21021120101121 is a deficient number, since it is larger than the sum of its proper divisors (12404109653247).

21021120101121 is a wasteful number, since it uses less digits than its factorization.

21021120101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446821.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21021120101121 its reverse (12110102112012), we get a palindrome (33131222213133).

The spelling of 21021120101121 in words is "twenty-one trillion, twenty-one billion, one hundred twenty million, one hundred one thousand, one hundred twenty-one".