21001212110102 has 32 divisors (see below), whose sum is σ = 36043178603520. Its totient is φ = 8990246311200.

The previous prime is 21001212110041. The next prime is 21001212110129. The reversal of 21001212110102 is 20101121210012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133961399 + ... + 134118077.

It is an arithmetic number, because the mean of its divisors is an integer number (1126349331360).

Almost surely, 2^{21001212110102} is an apocalyptic number.

21001212110102 is a deficient number, since it is larger than the sum of its proper divisors (15041966493418).

21001212110102 is a wasteful number, since it uses less digits than its factorization.

21001212110102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167556.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21001212110102 its reverse (20101121210012), we get a palindrome (41102333320114).

The spelling of 21001212110102 in words is "twenty-one trillion, one billion, two hundred twelve million, one hundred ten thousand, one hundred two".