21002111001212 has 24 divisors (see below), whose sum is σ = 41388324321792. Its totient is φ = 9238465249200.

The previous prime is 21002111001197. The next prime is 21002111001227. The reversal of 21002111001212 is 21210011120012.

It is an interprime number because it is at equal distance from previous prime (21002111001197) and next prime (21002111001227).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7698719678 + ... + 7698722405.

It is an arithmetic number, because the mean of its divisors is an integer number (1724513513408).

Almost surely, 2^{21002111001212} is an apocalyptic number.

21002111001212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21002111001212 is a deficient number, since it is larger than the sum of its proper divisors (20386213320580).

21002111001212 is a wasteful number, since it uses less digits than its factorization.

21002111001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15397442129 (or 15397442127 counting only the distinct ones).

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

Adding to 21002111001212 its reverse (21210011120012), we get a palindrome (42212122121224).

The spelling of 21002111001212 in words is "twenty-one trillion, two billion, one hundred eleven million, one thousand, two hundred twelve".