21121100201031 has 16 divisors (see below), whose sum is σ = 28848660841728. Its totient is φ = 13737144344000.

The previous prime is 21121100201029. The next prime is 21121100201051. The reversal of 21121100201031 is 13010200112112.

It is a cyclic number.

It is not a de Polignac number, because 21121100201031 - 2¹ = 21121100201029 is a prime.

It is a super-2 number, since 2×21121100201031² (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 21121100201031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121100201051) 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, 10389550 + ... + 12254996.

It is an arithmetic number, because the mean of its divisors is an integer number (1803041302608).

Almost surely, 2^{21121100201031} is an apocalyptic number.

21121100201031 is a deficient number, since it is larger than the sum of its proper divisors (7727560640697).

21121100201031 is a wasteful number, since it uses less digits than its factorization.

21121100201031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957542.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21121100201031 its reverse (13010200112112), we get a palindrome (34131300313143).

The spelling of 21121100201031 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred million, two hundred one thousand, thirty-one".