21121100211010 has 8 divisors (see below), whose sum is σ = 38017980379836. Its totient is φ = 8448440084400.

The previous prime is 21121100210981. The next prime is 21121100211011. The reversal of 21121100211010 is 1011200112112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19261468886521 + 1859631324489 = 4388789^2 + 1363683^2 .

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

It is a super-2 number, since 2×21121100211010² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121100211011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056055010541 + ... + 1056055010560.

Almost surely, 2^{21121100211010} is an apocalyptic number.

21121100211010 is a deficient number, since it is larger than the sum of its proper divisors (16896880168826).

21121100211010 is a wasteful number, since it uses less digits than its factorization.

21121100211010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112110021108.

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

Adding to 21121100211010 its reverse (1011200112112), we get a palindrome (22132300323122).

The spelling of 21121100211010 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred million, two hundred eleven thousand, ten".