100121210021 has 16 divisors (see below), whose sum is σ = 115456121088. Its totient is φ = 85046976000.

The previous prime is 100121210003. The next prime is 100121210039. The reversal of 100121210021 is 120012121001.

It is an interprime number because it is at equal distance from previous prime (100121210003) and next prime (100121210039).

It is not a de Polignac number, because 100121210021 - 2⁶ = 100121209957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100121209984 and 100121210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121210041) 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, 332501 + ... + 557493.

It is an arithmetic number, because the mean of its divisors is an integer number (7216007568).

Almost surely, 2^100121210021 is an apocalyptic number.

It is an amenable number.

100121210021 is a deficient number, since it is larger than the sum of its proper divisors (15334911067).

100121210021 is a wasteful number, since it uses less digits than its factorization.

100121210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225572.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 100121210021 its reverse (120012121001), we get a palindrome (220133331022).

The spelling of 100121210021 in words is "one hundred billion, one hundred twenty-one million, two hundred ten thousand, twenty-one".